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1.
Ordering processes and
phase transitions in ammonium-containing crystals of A2BWO3F3 elpasolites – com?parative
Raman
and infrared study [Text] / A. N. Vtyurin, A. S. Krylov [et al.]> //
The 6th International Seminar on Ferroelastics Physics (ISFP-6) : Voronezh, September 22–25, 2009. - P23
Доп.точки доступа:
Vtyurin, A.N.; Krylov, A.S.; Gerasimova, Ju.V.; Ivanenko, A.A.; Shestakov, N.P.; Laptash, N.M.; International Seminar on Ferroelastic Physics(6 ; 2009 ; Sept. ; 22-25 ; Voronezh)
}
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2.
Raman
spectroscopy of
Wadsley phases of vanadium oxide / P. Shvets, A. Krylov, K. Maksimova, A. Goikhman> // J.
Raman
Spectrosc. - 2024. -
Vol. 55
,
Is. 4
. - P. 445-458,
DOI
10.1002/jrs.6644. - Cited References: 133. - This work was prepared with support from the Ministry of Science and Higher Education of the Russian Federation (project FZWM-2020-0008) . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
phase transitions
--
V3O7
--
V4O9
--
V6O13
--
VO2 (B)
Аннотация:
We summarize the current knowledge on crystal structures, synthesis, applications, and
Raman
spectroscopy of Wadsley phases of vanadium oxide, including VO2 (B), V6O13, V4O9, V3O7, and V2O5. While these oxides have garnered significant attention for potential energy storage applications and have been studied for decades, there remains inconsistency in data regarding their characteristic
Raman
spectra. To address this, we synthesized a series of Wadsley phases by physical vapor deposition of amorphous vanadium oxide films and subsequent annealing in a controlled environment. X-ray diffraction studies confirmed the formation of VO2 (B), V6O13, V4O9, and V3O7. We meticulously measured the room-temperature
Raman
spectra of these phases, offering robust reference data for the easy identification of vanadium oxides in unknown samples. Finally, we studied low-temperature phase transitions in VO2 (B) and V6O13.
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Scopus
Держатели документа:
Research and Educational Center “Functional Nanomaterials”, Immanuel Kant Baltic Federal University, Kaliningrad, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Shvets, P.; Krylov, A. S.; Крылов, Александр Сергеевич; Maksimova, K.; Goikhman, A.
}
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3.
Temperature
Raman
study
of Li4Ti5O12 and ambiguity in the number of its bands / A. A. Nikiforov, A. S. Krylov, S. N. Krylova [et al.]> // J.
Raman
Spectrosc. - 2024. -
Vol. 55
,
Is. 3
. - P. 406-415,
DOI
10.1002/jrs.6641. - Cited References: 51. - The research was funded by the Russian Science Foundation (project No 22-22-00350, https://rscf.ru/project/22-22-00350) . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
defects
--
distortions
--
lithium titanate
--
lithium titanium oxide
--
spinel structure
Аннотация:
The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X-Ray diffraction and
Raman
spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted
Raman
spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed
Raman
-active bands. Our low-temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.
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Держатели документа:
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russia
Independent Researcher, Ekaterinburg, Russia
Доп.точки доступа:
Nikiforov, A. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Gorshkov, V. S.; Pelegov, D. V.
}
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4.
Solid state synthesis,
structural, DFT and spectroscopic analysis of EuAl3(BO3)4 / A. S. Oreshonkov, A. S. Aleksandrovsky, O. D. Chimitova [et al.]> // Mater. Chem. Phys. - 2024. -
Vol. 320
. - Ст. 129400,
DOI
10.1016/j.matchemphys.2024.129400. - Cited References: 55. - The work was carried out within the state assignment No FWES-2024-0003 of Kirensky Institute of Physics. This work was partially supported by the state order of BINM SB RAS (0273-2021-0008). The samples for this research were synthesized using equipment of the CCU BINM SB RAS. The reflectance spectrum was obtained at the Center for Optical and Laser Materials Research of Research park of St. Petersburg State University. The SEM measurements were performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" . - ISSN 0254-0584. - ISSN 1879-3312
Перевод заглавия:
Твердофазный синтез, структурный, квантово-химический (DFT) и спектроскопический анализ EuAl3(BO3)4
Кл.слова (ненормированные):
EuAl(BO)
--
Huntite
--
X-ray diffraction
--
SEM
--
DFT
--
Charge transfer
--
Raman
--
Infrared
--
Luminescence
Аннотация:
Huntite-like borates are versatile and promising materials with wide range of applications in frequency conversion, UV light generation, lighting, displays, quantum information storage, and more, demonstrated by their various properties and uses in scientific research. In this work, EuAl3(BO3)4 powder was prepared through multi-stage solid-state reaction method using high-purity starting reagents: Eu2O3, Al2O3 and H3BO3, considering a 20 wt% excess of H3BO3 to compensate for B2O3 volatilization. Obtained samples undergo several treatments at varying temperatures and their phase purity is subsequently verified through powder X-ray diffraction analysis. The scanning electron microscopy reveals that resulting EuAl3(BO3)4 powder consists of granules exhibiting irregular morphologies with dimensions of 0.5–8 μm. The electronic band structure of EuAl3(BO3)4, calculated using the GGA PBE method, reveals f-states of Eu near 4 eV. These states do not produce emphasized peaks on simulated absorbance spectra. Using of DFT + U for the f-states of Eu pushed up f-bands above 6 eV and the charge transfer from p-O to d-Eu was obtained (Egdirect = 5.63 eV, Egindirect = 5.37 eV using Ueff = 4 eV). The variation of Ueff has a weak influence on the position of the bottom of the conduction band. The experimental bandgaps of EuAl3(BO3)4 crystalline powder, both direct and indirect, are found to be 3.96 and 3.67 eV, correspondingly. These values are lower than theoretical values what is associated with limitations of DFT calculations involving f electrons. The
Raman
spectrum of EuAl3(BO3)4 powder is discussed, detailing the contributions of different ions to specific spectral bands. Investigation of high-resolution luminescence spectra shows the possibility to estimate the content of defects by the testing the violation of the prohibition of ultranarrow 5D0 → 7F0 line that is forbidden in the ideal crystalline structure of trigonal EuAl3(BO3)4.
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Держатели документа:
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk, 660041, Russia
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russia
Laboratory of Oxide Systems, Baikal Institute of Nature Management, SB RAS, Ulan-Ude, 670047, Russia
Center for Optical and Laser Materials Research, Saint-Petersburg State University, Saint-Petersburg, 199034, Russia
Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, Moscow, 119334, Russia
Plekhanov Russian University of Economics, Moscow, 117997, Russia
Moscow Institute of Physics and Technology, Dolgoprudny, 141700, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
School of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russia
Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk, 630090, Russia
Department of Molecular Electronics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, 660036, Russia
Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, 660041, Russia
Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Chimitova, O.D.; Pankin, D.V.; Popov, Z.I.; Sukhanova, E.V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Adichtchev, S.V.; Pugachev, A.M.; Nemtsev, I. V.; Немцев, Иван Васильевич
}
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5.
Raman
study of
decomposition of Na-bearing carbonates in water fluid at high P–T parameters / S. Goryainov, A. Krylov, U. Borodina [et al.]> // Spectrochim. Acta - A: Mol. Biomol. Spectrosc. - 2024. -
Vol. 322
. - Ст. 124801,
DOI
10.1016/j.saa.2024.124801. - Cited References: 74. - Authors thank V.S. Shevchenko, A.F. Shatskiy, A.G. Sokol and A.V. Golovin for fruitful discussion. We acknowledge I.N. Kupriyanov for discussion and measurements of FTIR spectra of the samples. This work was carried out within the framework of the Russian Federation state assignment of the Sobolev Institute of Geology and Mineralogy SB RAS (state registration number: 122041400176-0) and A.K., S.K and A.V. thanks for support the Russian Federation state assignment of Kirensky Institute of Physics, Federal Research Center KSC SB RAS (state registration number: FWES-2024-0003). Work partially supported by the Russian Foundation for Basic Researches (RFBR-21-55-14001 ANF a grant). Equipment and devices of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” were used for
Raman
experiments at high P–T conditions . - ISSN 1386-1425. - ISSN 1873-3557
Кл.слова (ненормированные):
Raman
spectroscopy
--
Carbonates
--
High pressure
--
High temperature
--
Abiogenic formation of organics
--
Organic formates
--
Organic molecular crystals
Аннотация:
The study of Na-carbonates stability and their transformations in aqueous carbonate fluid under high P–T conditions is relevant from the point of view of the understanding geochemical processes of the Na-assisted carbon circulation in the Earth’s crust and subduction zones. In situ
Raman
study of Na-bearing carbonate-water-Fe-metal system in diamond anvil cell (DAC) at high P–T conditions revealed that carbonates decompose with abiogenic formation of formates and other organic compounds that differs from behavior of carbonates in dry system. XRD and FTIR methods have been used additionaly to determine the phase composition. Na-bearing carbonates (nahcolite NaHCO3, shortite Na2Ca2(CO3)3 and cancrinite Na7Ca[(CO3)1.5Al6Si6O24]·2H2O) in aqueous fluid decompose to form simple carbonates and formates (as dominant organic molecules) at moderate P–T parameters (above ∼0.2 GPa, 200°C). Our experimental results directly confirm the hypothesis of Horita and Berndt (Science, 1999) about possible yield of organic formates in the carbonate-water-metal system. Nahcolite NaHCO3 in aqueous fluid in the presence of Fe metal decomposes into anhydrous phases: natrite γ-Na2CO3, siderite, magnetite (due to dissolution of Fe steel gasket), Na-formate and likely organic molecular crystalline solvate of Na-formate and methyl formate. Shortite decays into anhydrous phases: aragonite CaCO3, Na-Ca-formates and an amorphous phase. Cancrinite decomposes to unidentified carbonate-alumonosilicate phases, Na-Ca-formates and unknown organic molecular crystal. Magnetite is also formed in this system due to dissolution of Fe steel gasket used in DAC. The present study provides a new insight in processes of abiogenic formation of organic matter from carbonates in the crust and upper mantle.
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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, prospect Acad. Koptyug 3, Novosibirsk, 630090, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, bld. 38, Krasnoyarsk, 660036, Russia
Доп.точки доступа:
Goryainov, S.; Krylov, A. S.; Крылов, Александр Сергеевич; Borodina, U.; Likhacheva, A.; Krylova, S. N.; Крылова, Светлана Николаевна; Seryotkin, Yu.; Bogdanov, N.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Grishina, S.
}
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6.
Оптические свойства, структурная
однородность и дефектные центры монокристаллов двойного легирования LiNbO3:Zn:Mg, полученных по разным технологиям / Р. А. Титов, М. В. Смирнов, Л. А. Бобрева [и др.]> // Перспективн. материалы. - 2024. -
№ 8
. - С. 5-22,
DOI
10.30791/1028-978X-2024-8-5-22. - Библиогр.: 60. - Работа выполнена при частичной финансовой поддержке правительства Мурманской области научно-исследовательских проектов молодых учёных (№ 201 от 27 ноября 2023 г.) и в рамках государственного задания Министерства науки и высшего образования РФ (регистрационный номер FMEZ-2022-0016) . - ISSN 1028-978X
Перевод заглавия:
Optical properties, structural homogeneity and defect centers of double-doped LiNbO3:Zn:Mg single crystals obtained using different technologies
Кл.слова (ненормированные):
кристалл ниобата лития
--
двойное легирование
--
OH-группы
--
центры люминесценции
--
точечные и комплексные дефекты
--
спектроскопия КРС
--
лазерная коноскопия
--
фотоиндуцированное рассеяние света
--
lithium niobate crystal
--
double doping
--
OH groups
--
luminescence centers
--
point and complex defects
--
Raman
spectroscopy
--
laser conoscopy
--
photoinduced light scattering
Аннотация:
Методами спектроскопии комбинационного рассеяния света, инфракрасной спектроскопии поглощения, фотолюминесценции, лазерной коноскопии и фотоиндуцированного рассеяния света исследованы особенности дефектной структуры номинально чистого кристалла LiNbO3стех и монокристаллов двойного легирования LiNbO3:Zn:Mg (3,45:1,41 мол. %) и LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученных по технологии гомогенного и прямого легирования. Кристаллы двойного легирования LiNbO3:Zn:Mg, полученные по разным технологиям, обладают высоким сопротивлением повреждению лазерным излучением. Кристалл LiNbO3:Zn:Mg (3,45:1,22 мол. %), полученный по технологии прямого легирования, характеризуется более низкой композиционной однородностью по сравнению с кристаллом LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученным по технологии гомогенного легирования. По спектрам комбинационного рассеяния света обнаружено, что особенности дефектной структуры кристаллов двойного легирования LiNbO3:Zn:Mg в большей степени определяет примесь магния. Обнаруженный факт может быть причиной преобладания влияния упорядочивающего механизма катионов магния (~ 1,22 – 1,44 мол. %) над влиянием разупорядочивающего механизма катионов цинка (~ 3,45 мол. %) на особенности структурных единиц катионной подрешетки. Наименьшее значение концентрации ОН-групп и интенсивности фотолюминесценции в ближней ИК области характерно для кристалла LiNbO3:Zn:Mg (3,45:1,41 мол. %), полученного по технологии гомогенного легирования.
Features of the defect structure of a nominally pure LiNbO3stoich crystal and doubly doped LiNbO3:Zn:Mg (3.45:1.41 mol. %) and LiNbO3:Zn:Mg (3.45:1.22 mol. %) single crystals have been studied using
Raman
spectroscopy, infrared absorption spectroscopy, photoluminescence, laser conoscopy and photoinduced light scattering. The material for the study has been obtained using homogeneous and direct doping technology. It has been shown that double-doped LiNbO3:Zn:Mg crystals obtained using different technologies have high resistance to damage by laser radiation. However, the LiNbO3:Zn:Mg (3.45:1.22 mol. %) crystal obtained using direct doping technology is characterized by lower compositional uniformity compared to the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology.
Raman
spectra have showed that the features of the defect structure of double-doped LiNbO3:Zn:Mg crystals are largely determined by the magnesium impurity. This may be the reason that the influence of the ordering mechanism of magnesium cations (~ 1.22 – 1.44 mol. %) prevails over the influence of the disordering mechanism of zinc cations (~ 3.45 mol. %) on the features of the structural units of the cation sublattice. It has been found that the lowest concentration of OH groups and photoluminescence intensity in the near-IR region is characteristic of the LiNbO3:Zn:Mg (3.45:1.41 mol. %) crystal obtained using homogeneous doping technology.
Держатели документа:
Институт химии и технологии редких элементов и минерального сырья им. И.В. Тананаева — обособленное подразделение федерального государственного бюджетного учреждения науки Федерального исследовательского центра “Кольский научный центр Российской академии наук” (184209 Апатиты, Мурманская обл., ул. Академгородок, 26а)
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук — обособленное подразделение Федерального государственного бюджетного научного учреждения “Федеральный исследовательский центр “Красноярский научный центр Сибирского отделения Российской академии наук” (660036 Красноярск, ул. Академгородок, 50, стр. 38)
Доп.точки доступа:
Титов, Р. А.; Смирнов, М. В.; Бобрева, Л. А.; Теплякова, Н. А.; Палатников, М. Н.; Бирюкова, И. В.; Маслобоева, С. М.; Крылов, Александр Сергеевич; Krylov, A. S.; Втюрин, Александр Николаевич; Vtyurin, A. N.; Сидоров, Н. В.
}
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7.
Analyzing the symmetry
of the
Raman
spectra of crystals according to angular dependences / E. V. Golovkina, S. N. Krylova, A. N. Vtyurin, A. S. Krylov> // Bull. Russ. Acad. Sci. Phys. - 2024. -
Vol. 88
,
Is. 5
. - P. 773-778,
DOI
10.1134/S1062873824706573. - Cited References: 32. - This work was supported by the Russian Foundation for Basic Research, project no. 21-52-12018. The authors are grateful to Dr. Irena Senkovska for providing our DUT-8(Ni) samples . - ISSN 1062-8738. - ISSN 1934-9432
Кл.слова (ненормированные):
angular dependences of
Raman
scattering
--
metal–organic framework crystals
Аннотация:
The authors propose a way of reconstructing the
Raman
tensor by studying the angular dependences of the intensities of the
Raman
lines of unoriented microcrystals. The technique is verified using familiar calomel Hg2Cl2 crystals. It is shown that the lines on DUT-8 (Ni) crystals indicating phases with open and closed pores have different types of symmetries. The technique can be used to reconstruct the
Raman
tensor for any unoriented crystalline sample.
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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Доп.точки доступа:
Golovkina, E. V.; Головкина, Елена Вячеславовна; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич
}
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8.
The relationship between
the structural characteristics of α-Fe2O3 catalysts and their lattice oxygen reactivity regarding hydrogen / N. Kirik, A. Krylov, A. Boronin [et al.]> // Materials. - 2023. -
Vol. 16
,
Is. 12
: The 15th Anniversary of Materials — Recent Advances in Catalytic Materials. - Ст. 4466,
DOI
10.3390/ma16124466. - Cited References: 63. - This work was conducted within the framework of the budget project for the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, Federal Research Center KSC SB RAS, No. FWES–2021–0013 . - ISSN 1996-1944
Кл.слова (ненормированные):
α-Fe2O3
--
catalysts
--
calcinations
--
XRD
--
XPS
--
Raman
spectroscopy characterization
--
temperature-programmed reduction
Аннотация:
In this paper, the relationship between the structural features of hematite samples calcined in the interval of 800–1100 °C and their reactivity regarding hydrogen studied in the temperature-programmed reaction (TPR-H2) was studied. The oxygen reactivity of the samples decreases with the increasing calcination temperature. The study of calcined hematite samples used X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), and
Raman
spectroscopy, and their textural characteristics were studied also. According to XRD results, hematite samples calcined in the temperature range under study are monophase, represented by the α-Fe2O3 phase, in which crystal density increases with increasing calcination temperature. The
Raman
spectroscopy results also register only the α-Fe2O3 phase; the samples consist of large, well-crystallized particles with smaller particles on their surface, having a significantly lower degree of crystallinity, and their proportion decreases with increasing calcination temperature. XPS results show the α-Fe2O3 surface enriched with Fe2+ ions, whose proportion increases with increasing calcination temperature, which leads to an increase in the lattice oxygen binding energy and a decrease in the α-Fe2O3 reactivity regarding hydrogen.
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Держатели документа:
Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Institute of Chemistry and Chemical Technology, 50/24, Akademgorodok, 660036 Krasnoyarsk, Russia
Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Kirensky Institute of Physics, 50/38, Akademgorodok, 660036 Krasnoyarsk, Russia
Federal Research Center Boreskov Institute of Catalysis, 5, Ac. Lavrentieva Ave., 630090 Novosibirsk, Russia
Department of Chemistry, 79, Svobodny Ave., Siberian Federal University, 660041 Krasnoyarsk, Russia
Доп.точки доступа:
Kirik, N.; Krylov, A. S.; Крылов, Александр Сергеевич; Boronin, A.; Koshcheev, S.; Solovyov, L.; Rabchevskii, E.; Shishkina, N.; Anshits, A.
}
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9.
Magnetic, optical, and
thermic properties of SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds / N. N. Habibullayev, N. G. Naumov, A. N. Lavrov [et al.]> // Magnetochemistry. - 2023. -
Vol. 9
,
Is. 8
. - Ст. 194,
DOI
10.3390/magnetochemistry9080194. - Cited References: 36. - The study was funded by the Russian Science Foundation, project No. 23-23-00488 . - ISSN 2312-7481
Перевод заглавия:
Магнитные, оптические и термические свойства соединений SrLnCuSe3 (Ln = Dy, Ho, Er, Tm)
Кл.слова (ненормированные):
single-crystal X-ray diffraction
--
Curie–Weiss dependence
--
magnetic susceptibility
--
effective magnetic momentum
--
bandgap
--
DFT calculations
--
Raman
spectrometry
--
thermal analysis
--
scanning electron microscope
Аннотация:
SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds crystallize in the Pnma and Cmcm orthorhombic space group and belong to the Eu2CuS3 and KCuZrS3 structural type, respectively. According to a single-crystal XRD study, the SrTmCuSe3 unit cell parameters are a = 4.0631 (4), b = 13.4544 (14), c = 10.4430 (10) A, and V = 570.88 (10) A3. All the studied SrLnCuSe3 samples in the temperature range of 1.77–300 K demonstrate paramagnetic behavior without any features pointing to magnetic ordering. The measured Curie constants coincide with the values expected for Ln3+ ions with good accuracy, which confirms the stoichiometric composition of the samples and the non-magnetic state of the copper ions, Cu1+ (S = 0). The conducted optical absorption study showed that the polycrystalline SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) samples are semiconductors with a direct bandgap ranging from 2.14 eV to 2.31 eV. Two indirect bandgaps were revealed and explained by the presence of optical transitions to highly dispersive subbands in the conduction band. The compounds demonstrate two reversible phase transitions α⇆β, β⇆γ and an incongruent melting at 1606 K (Dy), 1584 K (Ho), 1634 K (Er), and 1620 K (Tm) associated with the formation of solid solutions of SrSe, Cu2-XSe, and Ln2Se3 binary compounds.
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Держатели документа:
Institute of Chemistry, University of Tyumen, 625003 Tyumen, Russia
Nikolaev Institute of Inorganic Chemistry SB RAS, 630090 Novosibirsk, Russia
Kirensky Institute of Physics, Federal Research Center, KSC, SB RAS, 660036 Krasnoyarsk, Russia
Department of Photonics and Laser Technology, Siberian Federal University, 660036 Krasnoyarsk, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center, KSC, SB RAS, 660036 Krasnoyarsk, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, 625003 Tyumen, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Department of Physical and Applied Chemistry, Kurgan State University, 640020 Kurgan, Russia
Department of General and Special Chemistry, Industrial University of Tyumen, 625000 Tyumen, Russia
Institute of Solid State Chemistry, UB RAS, 620990 Ekaterinburg, Russia
Доп.точки доступа:
Habibullayev, N. N.; Naumov, N. G.; Lavrov, A.N.; Kuratieva, N. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Palamarchuk, I. V.; Yurev, I. O.; Denisenko, Y. G.; Andreev, O. V.; Zakharova, A. D.
}
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10.
Density-functional study of
the Si/SiO2 interfaces in short-period superlattices: Vibrational states and
Raman
spectra / M. Smirnov, E. Roginskii, A. Savin [et al.]> // Photonics. - 2023. -
Vol. 10
,
Is. 8
. - Ст. 902,
DOI
10.3390/photonics10080902. - Cited References: 61. - The study was supported by grants from the Russian Science Foundation (project No. 22-22-20021) and the Saint-Petersburg Science Center (project No. 32/2022), using the resources of the Computing Center and the Center for Optical and Laser Materials Research at the Research Park of St. Petersburg State University. - The study was performed using the resources of the Computing Center and the Center for Optical and Laser Materials Research at the Research Park of St. Petersburg State University. The authors thank Konstantin Smirnov for his valuable advice. The calculations were also performed in part using the facilities of the JSCC supercomputer center at RAS and the Konstantinov computational center at the Ioffe Institute . - ISSN 2304-6732
Кл.слова (ненормированные):
silicon
--
cristobalite
--
interface
--
superlattice
--
Raman
spectra
--
DFT modelling
Аннотация:
Raman
spectroscopy has proven its effectiveness as a highly informative and sensitive method for the nondestructive analysis of layered nanostructures and their interfaces. However, there is a lack of information concerning the characteristic phonon modes and their activity in Si/SiO2 nanostructures. In order to overcome this problem, the phonon states and
Raman
spectra of several Si/SiO2 superlattices (SL) with layer thicknesses varied within 0.5–2 nm are studied using DFT-based computer modeling. Two types of structures with different interfaces between crystalline silicon and SiO2 cristobalite were studied. A relationship between the phonon states of heterosystems and the phonon modes of the initial crystals was established. Estimates of the parameters of deformation potentials are obtained, with the help of which the shifts of phonon frequencies caused by elastic strains in the materials of the SL layers are interpreted. The dependence of intense
Raman
lines on the SL structure has been studied. Several ways have been proposed to use this information, both for identifying the type of interface and for estimating the structural parameters. The obtained information will be useful for the spectroscopic characterization of the silicon/oxide interfaces.
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Держатели документа:
Faculty of Physics, Saint-Petersburg State University, Universitetskaya nab. 7/9, Saint-Petersburg 199034, Russia
Laboratory of Spectroscopy of Solid State, Ioffe Institute, Politehnicheskaya St. 26, Saint-Petersburg 194021, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok St. 50/38, Krasnoyarsk 660036, Russia
School of Engineering and Construction, Siberian Federal University, Svobodny pr. 82, Krasnoyarsk 660041, Russia
Center for Optical and Laser Materials Research, Research Park, Saint-Petersburg State University, Universitetskaya nab. 7/9, Saint-Petersburg 199034, Russia
Доп.точки доступа:
Smirnov, Mikhail; Roginskii, Evgenii; Savin, Aleksandr; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Pankin, Dmitrii
}
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11.
Shchapova, Yuliya V.
.
Structural characteristics of radiation-amorphized ZrSiO4:U,Th according to
Raman
spectroscopy of Boson peak / Yu. V. Shchapova, A. S. Krylov, S. L. Votyakov> // J.
Raman
. Spectrosc. - 2023. -
Vol. 54
,
Is. 6
. - P. 662-673,
DOI
10.1002/jrs.6526. - Cited References: 66. - The study was carried out within IGG UB RAS State assignment, registration number 123011800012-9 (YVS and SLV). The authors thank Dmitry Zamyatin for performing electron probe microanalysis of zircon chemical composition. The authors are grateful to Olga Galakhova for X-ray diffraction measurements. The equipment of the «Geoanalitik» shared research facilities of the IGG UB RAS was used, the re-equipment and comprehensive development of which is financially supported by the grant of the Ministry of Science and Higher Education of the Russian Federation, Agreement No. 075-15-2021-680 (YVS and SLV). The temperature
Raman
experiments were performed in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center ‘Krasnoyarsk Science Center SB RAS’ . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
amorphous-crystalline structure
--
Boson peak
--
radiation damage
--
zircon
Аннотация:
The structure of the amorphous fraction and the tensile-compressive stressesin amorphous-crystalline radiation-damaged zircon ZrSiO:U,Th depending on radiation dose and temperature (8–350 K) are investigated according to
Raman
spectroscopy of Boson peak for the first time. The Boson peak at 60–70 cm-1 associated with localized phonon states in the amorphous fraction (fa) is recorded at low temperatures (T ˂ 100 K) for samples with fa ˂ 30% and over the entire temperature range 8–350 K for fa ˃ 70%. The wider localized states distribution in the latter case is considered as a sign of the amorphous phase structure evolution with an increase in radiation dose. The estimates of anatomic correlation radius based on the Ioffe–Regel criterion are similar to those in glasses, Rc2:0 – 2:3 nm. The monotonic increase in Rc value during heating of zircon with fa ˃ 70% is governed by thermal expansion of the percolating amorphous fraction. The nonmonotonic variations of the Rc value in zircon with fa ˂ 30% is determined by the stresses in the amorphous fraction due to the mismatch in thermal expansion coefficient (CTE) and elastic moduli of the amorphous and crystalline phases depending on temperature; a change in the sign of the crystalline fraction CTE at 30 K is assumed. The Boson peak disappearance at 100 K in zircon with fa ˂ 30% during heating conforms to with the violation of the phonon localization as a consequence of amorphous fraction contraction and partial ordering. The data obtained are important for predicting the thermal and mechanical properties of heterogeneous radiation-damaged materials and nanocomposites.
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Держатели документа:
Zavaritsky Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences,Yekaterinburg, Russia
Ural Federal University named after the first President of Russia B. N. Yeltsin,Yekaterinburg, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS,Krasnoyarsk, Russia
Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Votyakov, Sergei L.
}
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12.
Structural, spectroscopic, electric
and magnetic properties of new trigonal K5FeHf(MoO4)6 orthomolybdate / V. Grossman, V. Atuchin, B. G. Bazarov [et al.]> // Molecules. - 2023. -
Vol. 28
,
Is. 4
. - Ст. 1629,
DOI
10.3390/molecules28041629. - Cited References: 82. - This work was supported by the state order of BINM SB RAS (0273-2021-0008), IIC (121031700318-8), ISP (FWGW-2022-0006) and the Russian Science Foundation (21-19-00046). The research was granted by the Government of the Russian Federation (075-15-2022-1132) . - ISSN 1420-3049
Перевод заглавия:
Структурные, спектроскопические, электрические и магнитные свойства нового тригонального K5FeHf(MoO4)6 ортомолибдата
Кл.слова (ненормированные):
ternary molybdate
--
phase relations
--
crystal structure
--
Raman
--
electronic structure
--
magnetic properties
Аннотация:
A new multicationic structurally disordered K5FeHf(MoO4)6 crystal belonging to the molybdate family is synthesized by the two-stage solid state reaction method. The characterization of the electronic and vibrational properties of the K5FeHf(MoO4)6 was performed using density functional theory calculations, group theory,
Raman
and infrared spectroscopy. The vibrational spectra are dominated by vibrations of the MoO4 tetrahedra, while the lattice modes are observed in a low-wavenumber part of the spectra. The experimental gap in the phonon spectra between 450 and 700 cm−1 is in a good agreement with the simulated phonon density of the states. K5FeHf(MoO4)6 is a paramagnetic down to 4.2 K. The negative Curie–Weiss temperature of −6.7 K indicates dominant antiferromagnetic interactions in the compound. The direct and indirect optical bandgaps of K5FeHf(MoO4)6 are 2.97 and 3.21 eV, respectively. The K5FeHf(MoO4)6 bandgap narrowing, with respect to the variety of known molybdates and the ab initio calculations, is explained by the presence of Mott-Hubbard optical excitation in the system of Fe3+ ions.
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Держатели документа:
Laboratory of Oxide Systems, Baikal Institute of Nature Management, SB RAS, Ulan-Ude 670047, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, Novosibirsk 630090, Russia
Department of Applied Physics, Novosibirsk State University, Novosibirsk 630090, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, Novosibirsk 630073, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, Tomsk 634034, Russia
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660041, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
School of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Crystal Chemistry, Institute of Inorganic Chemistry, SB RAS, Novosibirsk 630090, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk 680021, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk 660041, Russia
Доп.точки доступа:
Grossman, V.; Atuchin, V. V.; Bazarov, B. G.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Eremin, E. V.; Еремин, Евгений Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич; Kuratieva, N.; Bazarova, J. G.; Maximov, N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Pervukhina, N.; Shestakov, N. P.; Шестаков, Николай Петрович
}
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13.
Structural and spectroscopic
effects of Li+ substitution for Na+ in LixNa1–xCaLa0.5Er0.05Yb0.45(MoO4)3 upconversion scheelite-type phosphors / C. S. Lim, A. Aleksandrovsky, M. Molokeev [et al.]> // Crystals. - 2023. -
Vol. 13
,
Is. 2
. - Ст. 362,
DOI
10.3390/cryst13020362. - Cited References: 63. - This study was funded by the Research Program through the Campus Research Foundation funded by Hanseo University in 2022 (2022046) . - ISSN 2073-4352
Перевод заглавия:
Структурные и спектроскопические эффекты замещения Na+ на Li+ в LixNa1-xCaLa0.5Er0.05Yb0.45(MoO4)3 ап-конверсионных люминофорах типа шеелита
Кл.слова (ненормированные):
microwave sol-gel synthesis
--
complex molybdate
--
scheelite
--
crystal structure
--
Raman
--
frequency up-conversion
--
band structure
Аннотация:
New triple molybdates LixNa1−xCaLa0.5(MoO4)3:Er3+0.05/Yb3+0.45 (x = 0, 0.05, 0.1, 0.2, 0.3) were manufactured successfully using the microwave-assisted sol-gel-based technique (MAS). Their room-temperature crystal structures were determined in space group I41/a by Rietveld analysis. The compounds were found to have a scheelite-type structure. In Li-substituted samples, the sites of big cations were occupied by a mixture of (Li, Na, La, Er, Yb) ions, which provided a linear cell volume decrease with the Li content increase. The increased upconversion (UC) efficiency and
Raman
spectroscopic properties of the phosphors were discussed in detail. The mechanism of optimization of upconversion luminescence upon Li content variation was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. The UC luminescence maximized at lithium content x = 0.05. The mechanism of UC optimization was shown to be due to the control of excitation/energy transfer channel, while the control of luminescence channels played a minor role. Over the whole spectral range, the
Raman
spectra of LixNa1−xCaLa0.5(MoO4)3 doped with Er3+ and Yb3+ ions were totally superimposed with the luminescence signal of Er3+ ions, and increasing the Li+ content resulted in the difference of Er3+ multiple intensity. The density functional theory calculations with the account for the structural disorder in the system of Li, Na, Ca, La, Er and Yb ions revealed the bandgap variation from 3.99 to 4.137 eV due to the changing of Li content. It was found that the direct electronic transition energy was close to the indirect one for all compounds. The determined chromaticity points (ICP) of the LiNaCaLa(MoO4)3:Er3+,Yb3+ phosphors were in good relation to the equal-energy point in the standard CIE (Commission Internationale de L’Eclairage) coordinates.
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Держатели документа:
Department of Aerospace Advanced Materials and Chemical Engineering, Hanseo University, Seosan 31962, Republic of Korea
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
School of Engineering and Construction, Siberian Federal University, 660041 Krasnoyarsk, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RAS, 630090 Novosibirsk, Russia
Research and Development Department, Kemerovo State University, 650000 Kemerovo, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, 630073 Novosibirsk, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, 634034 Tomsk, Russia
Доп.точки доступа:
Lim, Chang S.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Atuchin, V.
}
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14.
Arkhipkin, V. G.
Diffraction of a Laguerre-Gaussian beam in
Raman
interaction with a spatially periodic pump field / V. G. Arkhipkin, D. A. Ikonnikov, S. A. Myslivets> // Phys. Rev. A. - 2023. -
Vol. 107
,
Is. 2
. - Ст. 023519,
DOI
10.1103/PhysRevA.107.023519. - Cited References: 35. - This work was supported by the Russian Science Foundation (Grant No. 19-12-00203) . - ISSN 2469-9926. - ISSN 2469-9934
Аннотация:
We studied Fresnel diffraction of a Laguerre-Gaussian beam LGp,l with arbitrary azimuthal l and radial p indices on a grating induced during its
Raman
interaction with a spatially periodic pump field in an atomic medium. The diffraction pattern turned out to be more complex than the classical Talbot effect observed when a plane wave illuminates a two-dimensional grating. The simulation results show that, under certain conditions, at distances corresponding to the classical Talbot planes (integer and fractional), periodic amplitude-phase distributions appear. The diffraction patterns are not a probe-field image in the induced grating plane, but a regular array of vortex annular-shaped microbeams with an inhomogeneous intensity distribution depending on the l and p indices and with a topological charge equal to that of the initial probe beam. The intensity and spatial distribution of diffraction patterns can be controlled by
Raman
amplification in the induced grating by varying the pump-field intensity or the
Raman
detuning.
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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Department of Photonics and Laser Technology, Siberian Federal University, 660041 Krasnoyarsk, Russia
Доп.точки доступа:
Ikonnikov, D. A.; Иконников, Денис Андреевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Архипкин, Василий Григорьевич
}
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15.
Oreshonkov, A. S.
Phonon dynamics in MoSi2N4: insights from DFT calculations / A. S. Oreshonkov, E. V. Sukhanova, Z. I. Popov> // Phys. Chem. Chem. Phys. - 2023. -
Vol. 25
,
Is. 43
. - P. 29831-29841,
DOI
10.1039/D3CP02921B. - Cited References: 74. - The authors acknowledge financial support from Russian Science Foundation (project №21-73-20183, https://rscf.ru/project/21-73-20183/) . - ISSN 1463-9076. - ISSN 1463-9084
Кл.слова (ненормированные):
monolayer
--
bulk
--
Raman
spectrum
--
nanostructure
--
stability
Аннотация:
We have reported the density functional theory investigations on the monolayer, 2 layered and bulk MoSi2N4 in three structural modifications called as α1 [Science, DOI: 10.1126/science.abb7023], α2 and α3 [Adv. Funct. Mater., DOI: 10.1002/adfm.202214050]. We showed that in the case of monolayers the difference in total energies is less than 0.1 eV between α1 and α3 phases, and less than 0.2 eV between α1 and α2 geometries. The most energetically favorable layer stacking for the bulk structures of each phase was investigated. All considered modifications are dynamically stable from a single layer to a bulk structure in energetically favorable stacking.
Raman
spectra for the monolayer, 2 layered and bulk structures were simulated and the vibrational analysis was performed. The main difference between in the obtained spectra is associated with the position of the strongest band which depends on the Mo-N bond length. According to the obtained data, we can conclude that
Raman
line at 348 cm–1 in the experimental spectra of MoSi2N4, can have more complex explanation then just Γ-point
Raman
-active vibration as was discussed before in [Science, DOI: 10.1126/science.abb7023].
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Держатели документа:
Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, Moscow 119334, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center, KSC SB RAS, Krasnoyarsk 660036, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk 660041, Russia
Moscow Institute of Physics and Technology, Institutsky lane 9, Dolgoprudny, Moscow region, Russia
Доп.точки доступа:
Sukhanova, E. V.; Popov, Z. I.; Орешонков, Александр Сергеевич
}
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16.
Flux growth and
Raman
spectroscopy study of Cu2CrBO5 crystals / E. Moshkina, E. Eremin, M. Molokeev [et al.]> // Crystals. - 2023. -
Vol. 13
,
Is. 10
. - Ст. 1415,
DOI
10.3390/cryst13101415. - Cited References: 24. - The study was supported by a grant from the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation No. 22-12-20019; https://rscf.ru/project/22-12-20019/ . - ISSN 2073-4352
Перевод заглавия:
Исследование раствор-расплавного роста и спектров КР кристаллов Cu2CrBO5
Кл.слова (ненормированные):
flux growth
--
ludwigite
--
polarized
Raman
spectra
--
antiferromagnet
--
phase transition
Аннотация:
Multicomponent flux systems based on both Li2WO4-B2O3-Li2O-CuO-Cr2O3 and Bi2O3-MoO3-B2O3-Na2O-CuO-Cr2O3 were studied in order to grow Cu2CrBO5 crystals. The conditions for Cu2CrBO5 crystallization were investigated by varyingthe component ratios, and the peculiarities of their interaction were characterized by studying the formation sequence of high-temperature crystallizing phases. Special attention was paid to the problem of Cr2O3 solubility. Phase boundaries between CuCrO2, Cu2CrO4, and Cu2CrBO5 were considered. The crystal structure of the obtained samples was studied viasingle crystal and powder X-ray diffraction. The chemical composition of the grown crystals was examined using the EDX technique. Anactual ratio of Cu:Cr = 1.89:1.11 was found for Cu2CrBO5 grown from the lithium-tungstate system, which showed a small deviation from 2:1, implying the presence of a part of bivalent Cr2+ in the samples. Anomalies in the thermal dependence of magnetization were analyzed and compared with the previously obtained data for Cu2CrBO5. The anomaly at TC ≈ 42 K and the antiferromagnetic phase transition at TN ≈ 119 K were considered. Polarized
Raman
spectra of Cu2CrBO5 were obtained for the first time, and a comparative analysis of the obtained data with other monoclinic and orthorhombic ludwigites is presented. Along with the polarized room temperature spectra, the thermal evolution of
Raman
modes near the antiferromagnetic phase transition temperature TN ≈ 119 K is provided. The influence of the magnetic phase transition on the
Raman
spectra of Cu2CrBO5 is discussed.
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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronic, Siberian Federal University, 660041 Krasnoyarsk, Russia
Department of Physics, Siberian State University of Science and Technologies, 660037 Krasnoyarsk, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kokh, Dieter; Krylov, A. S.; Крылов, Александр Сергеевич
}
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17.
Phase diagram and
soft modes behavior TbFe3–xGax(BO3)4 solid solutions with huntite structure / A. S. Krylov, A. N. Vtyurin, I. A. Gudim [et al.]> // Opt. Spectrosc. - 2023. -
Vol. 131
,
Is. 9
. - P. 840-848,
DOI
10.1134/S0030400X23070081. - Cited References: 40. - The authors are grateful to the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and the Krasnoyarsk Regional Science Foundation for funding within the framework of the scientific project, grant no. 20-42-240009 r_a_Krasnoyarsk, as well as the Russian Foundation for Basic Research and the German Scientific Research Community (Deutsche Forschungsgemeinschaft) for financial support within the project no. 21-52-12018 NNIO_a . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
Raman
spectroscopy
--
temperature dependence
--
soft modes
--
ferroborates
--
phase diagramm
Аннотация:
The
Raman
spectra of four crystals of TbFe3–xGax(BO3)4 solid solutions (x from 0 to 0.54) were studied in the temperature range from 8 to 350 K. The temperatures of structural phase transitions were determined. The observed spectral behavior is characteristic to condensation and restoration of soft modes. Soft modes are associated with a structural phase transition from the R32 phase to the P3121 phase. The Compositions-Temperature phase diagram was constructed.
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Публикация на русском языке
Фазовая диаграмма и особенности поведения мягких мод в твердых растворах со структурой хантита TbFe3-xGax(BO3)4 [Текст] / А. С. Крылов, А. Н. Втюрин, И. А. Гудим [и др.] // Опт. и спектроскоп. - 2022. - Т. 130 Вып. 1. - С. 84-91
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Federal Research Center KSC SB, Russian Academy of Sciences, “Krasnoyarsk Scientific Center of the Siberian Branch of RAS”, 660036, Krasnoyarsk, Russia
Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Nemtsev, I. V.; Немцев, Иван Васильевич; Krylova, S. N.; Крылова, Светлана Николаевна
}
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18.
Determination of the
pore direction in a crystalline metal-organic framework by
Raman
spectroscopy and periodic calculations based on the electron density functional theory / N. V. Slyusarenko, I. D. Yushina, E. A. Slyusareva [et al.]> // Optoelectron. Instrum. Data Process. - 2023. -
Vol. 59
,
Is. 6
. - P. 693-702,
DOI
10.3103/S8756699023060134. - Cited References: 32. - This work was supported by the Russian Foundation for Basic Research (Russian Center of Scientific Information), project no. 21-52-12018. - We are grateful to Dr. Irena Senkovska for the presented DUT-8 (Ni, Co) samples . - ISSN 8756-6990. - ISSN 1934-7944
Кл.слова (ненормированные):
Raman
light scattering
--
metal-organic framework
--
pore orientation
--
electron density functional theory
Аннотация:
A method for the determination of pore orientation in metal-organic framework structures by polarized
Raman
spectra is proposed. The method involves sensitivity of the line intensity of
Raman
scattering to the geometry of propagation in a crystal. The operability of the method is shown by DUT-8 (Ni, Co) crystals. The obtained results are interpreted based on analysis of symmetry and direction of vibrations within periodic calculations of the electron density functional theory. The simultaneous approach allowed us to describe the vibrations and to find the principal crystal orientation collinear to the pore direction. The information on the pore orientation is necessary for problems of adsorption and design of complex multicomponent materials based on metal-organic framework.
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Публикация на русском языке
Определение направления пор в кристаллическом металлоорганическом каркасе с помощью спектроскопии комбинационного рассеяния света и периодических расчётов, основанных на теории функционала электронной плотности [Текст] / Н. В. Слюсаренко, И. Д. Юшина, Е. А. Слюсарева [и др.]. - 11 с. // Автометрия. - 2023. - Т. 59 № 6. - С. 41-51
Держатели документа:
Siberian Federal University, 660041, Krasnoyarsk, Russia
South Ural State University, 454080, Chelyabinsk, Russia
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Доп.точки доступа:
Slyusarenko, N. V.; Yushina, I. D.; Slyusareva, E. A.; Golovkina, E. V.; Головкина, Елена Вячеславовна; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич
}
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19.
Nikiforov, A. A.
Raman
spectra interpretation for Li4Ti5O12 with a spinel structure / A. A. Nikiforov, A. S. Krylov, D. V. Pelegov> //
Materials Science and Nanotechnology (MSN-2023) : abstract book of International conference / Ural Federal University; org. com. A. N. Vtyurin et al. - Ekaterinburg, 2023. - Ст. P26. - P. 110. - Russian Science Foundation (No 22-22-00350 . - ISBN 978-5-9500624-6-9
Перевод заглавия:
Интерпретация спектров КР Li4Ti5O12 со структурой шпинели
Материалы конференции
,
Читать в сети ИФ
Держатели документа:
School of Natural Sciences and Mathematics, Ural Federal University
Kirensky Institute of Physics SB RAS
Доп.точки доступа:
Vtyurin, A. N. \org. com.\; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Pelegov, D. V.; Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина; Ural Federal University; "Materials science and nanotechnology", International conference(2023 ; Aug. 27-30 ; Ekaterinburg)
}
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20.
Thermal evolution of
LiCoO2 structure and
Raman
spectra below 400 °C / A. A. Ryabin, A. S. Krylov, S. N. Krylova [et al.]> // J. Chem. Phys. - 2023. -
Vol. 159
,
Is. 8
. - Ст. 084706,
DOI
10.1063/5.0164135. - Cited References: 60. - The research was funded by the Russian Science Foundation (Project No. 22-22-00350, https://rscf.ru/project/22-22-00350). The
Raman
spectra measurements were made using equipment of the Ural Center for Shared Use “Modern nanotechnology” Ural Federal University (Reg. No. 2968), supported by the Ministry of Science and Higher Education of the Russian Federation (Project No. 075-15-2021-677). Authors warmly thank Professor Jongwoo Lim (Seoul National University) for samples, reading the manuscript, and providing his valuable comments . - ISSN 0021-9606. - ISSN 1089-7690
Перевод заглавия:
Термическая эволюция структуры LiCoO2 и спектры комбинационного рассеяния света ниже 400 °C
Аннотация:
Lithium cobalt oxide is a convenient model material for the vast family of cathode materials with a layered structure and still retains some commercial perspectives for microbatteries and some other applications. In this work, we have used ab initio calculations, x-ray diffraction,
Raman
spectroscopy, and a theoretical physical model, based on quasi-harmonic approximation with anharmonic contributions of the three-phonon and four-phonon processes, to study a temperature-induced change of
Raman
spectra for LiCoO2. The obtained values of shift and broadening for Eg and A1g bands can be used for quantitative characterization of temperature change, for example, due to laser-induced heating during
Raman
spectra measurements. The theoretical analysis of the experimental results lets us conclude that
Raman
spectra changes for LiCoO2 can be explained by the combination of thermal expansion of the crystal lattice and phonon damping by anharmonic coupling with comparable contributions of the three-phonon and four-phonon processes. The obtained results can be further used to develop
Raman
-based quality control tools.
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,
Scopus
Держатели документа:
Institute of Natural Sciences and Mathematics, Ural Federal University, Mira Street, 19, Ekaterinburg, 620002, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok, 50, Bld. 38, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Ryabin, A. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Kiselev, E. A.; Pelegov, D. V.
}
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