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Belyaev, B. A.
Impedance spectroscopy study of the electrical properties of cation-substituted barium hexaaluminate ceramics / B. A. Belyaev, N. A. Drokin, V. A. Poluboyarov // Phys. Solid State. - 2018. - Vol. 60, Is. 2. - P. 274-280, DOI 10.1134/S1063783418020063. - Cited References:18 . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
DIELECTRIC-RELAXATION
LIQUID-CRYSTALS
SPECTRA
Аннотация: We report on the behavior of frequency and temperature dependences of the impedance of a measuring cell in the form of a parallel-plate capacitor filled with barium hexaaluminate ceramics with four aluminum cations replaced by iron (BaO · 2Fe2O3 · 4Al2O3). The measurements have been performed in the frequency range of 0.5–108 Hz at temperatures of 20-375°C. A technique for determining the electrical properties of the investigated ceramics is proposed, which is based on an equivalent electric circuit allowing the recorded impedance spectra to be approximated with sufficiently high accuracy. The established spectral features are indicative of the presence of two electric relaxation times different from each other by three orders of magnitude. This fact is explained by the difference between the charge transport processes in the bulk of crystallites and thin intercrystallite spacers, for which the charge activation energies have been determined.

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Публикация на русском языке Беляев, Борис Афанасьевич. Исследование электрофизических характеристик катион-замещенной керамики гексаалюмината бария методом импедансной спектроскопии [Текст] / Б. А. Беляев, Н. А. Дрокин, В. А. Полубояров // Физ. тверд. тела. - 2018. - Т. 60 Вып. 2. - С. 269–275

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr KSC SB RAS, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia.
Russian Acad Sci, Inst Solid State Chem & Mechanochem, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Drokin, N. A.; Дрокин, Николай Александрович; Poluboyarov, V. A.; Беляев, Борис Афанасьевич
}
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Korshunov, A. V.
Raman spectra of 1,3,5-trichlorobenzene and 1,3,5-tribromobenzene / A. V. Korshunov, V. E. Volkov // J. Struct. Chem. - 1961. - Vol. 2, Is. 2. - P. 142-147, DOI 10.1007/BF00750990 . - ISSN 0022-4766
Аннотация: 1. Low-frequency Raman spectra of 1,3,5-trichlorobenzene and 1,3,5-tribromobenzene were studied; the results suggest that the compounds are isomorphous. 2. A method for interpreting the lines in low-frequency Raman spectra is described. 3. Certain differences between the spectral characteristics of 1,3,5-trichlorobenzene and 1,3,5-tribromobenzene are attributed to steric factors.

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Публикация на русском языке Коршунов, Анатолий Васильевич. Спектры комбинационного рассеяния света кристаллов 1,3,5-трихлорбензола и 1,3,5-трибромбензола [Текст] / В. Е. Волков, А. В. Коршунов // Журн. структ. химии. - 1961. - Т. 2 № 2. - С. 151-157

Держатели документа:
Institute of Physics, Siberian Division, Academy of Sciences USSR, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Volkov, V. E.; Волков, Валентин Ефремович; Коршунов, Анатолий Васильевич
}
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Tetragonal-tetragonal phase transition in CsScF4 crystal. Study of lattice dynamics and ramsn scattering spectra / A. S. Krylov [et al.] // Фаз. переходы и критич. явл. в конденс. средах : программа межд. конф. / предс. орг. ком. К. С. Александров. - Махачкала, 1998. - Ст. Б2-7. - P. 12

Доп.точки доступа:
Александров, Кирилл Сергеевич \предс. орг. ком.\; Aleksandrov, K. S.; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Shmygol, I. V.; Ageev, A. G.; Институт физики им. Х. И. Амирханова Дагестанского научного центра РАН; Дагестанский государственный университет; "Фазовые переходы и критические явления в конденсированных средах", международная конференция(1998 ; сент. ; 8-11 ; Махачкала)
}
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Effects of orientational disorder in lattice dynamics and raman spectra of Rb2ZnCl4 and CsLiSO4 crystals / A. N. Vtyurin [et al.] // Фаз. переходы и критич. явл. в конденс. средах : программа межд. конф. / предс. орг. ком. К. С. Александров. - Махачкала, 1998. - Ст. Б2-8. - P. 13

Доп.точки доступа:
Александров, Кирилл Сергеевич \предс. орг. ком.\; Aleksandrov, K. S.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Ageev, A. G.; Krylov, A. S.; Крылов, Александр Сергеевич; Shmygol, I. V.; Институт физики им. Х. И. Амирханова Дагестанского научного центра РАН; Дагестанский государственный университет; "Фазовые переходы и критические явления в конденсированных средах", международная конференция(1998 ; сент. ; 8-11 ; Махачкала)
}
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    Manifestation of magnetoelastic interactions in Raman spectra of HoxNd1-хFe3(BO3)4 crystals / A. S. Krylov [et al.] // J. Adv. Dielectr. - 2018. - Vol. 08, Is. 02. - Ст. 1850011, DOI 10.1142/S2010135X1850011X. - Cited References: 32 . - ISSN 2010-135X
   Перевод заглавия: Проявление магнитоупругих взаимодействий в спектрах комбинационного рассеяния кристаллов HoxNd1-xFe3(BO3)4
Кл.слова (ненормированные):
Multiferroic -- magnetoelastic interaction -- Raman spectra -- phase transition -- magnetic ordering
Аннотация: Raman spectra of Ho1-xNdxFe(BO3)4 (x=1, 0.75, 0.5, 0.25) have been studied in temperature range 10-400K. Two compositions (x=1, x=0.75) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions (x=0.75, 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Neel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe-O-Fe chains are observed. Calculations confirm the data obtained in the experiment.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Material Research Laboratory, Discipline of Physics and MEMS, Indian Institute of Technology Indore, Simrol, India

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Gudim, I. A.; Гудим, Ирина Анатольевна; Krylova, S. N.; Крылова, Светлана Николаевна; Kumar, R.; Vtyurin, A. N.; Втюрин, Александр Николаевич; International Workshop on Advanced Dielectric Materials and Their Applications(Oct. 8-11, 2017 ; Xi'an, China)
}
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    Zobov, V. E.
    On the effect of an inhomogeneous magnetic field on high-frequency asymptotic behaviors of correlation functions of spin lattices / V. E. Zobov, M. M. Kucherov // JETP Letters. - 2018. - Vol. 107, Is. 9. - P. 553-557, DOI 10.1134/S002136401809014X. - Cited References: 39 . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HEISENBERG PARAMAGNET
   SYSTEMS
   TIME
   RELAXATION
   DYNAMICS
   SPECTRA
Аннотация: Singular points of spin autocorrelation functions on the imaginary time axis, which determine the arguments of exponential high-frequency asymptotic behaviors, have been analyzed. It has been shown that randomly distributed inhomogeneous magnetic fields expand the wings of spectra of autocorrelation functions and, thereby, intensify the heating of a system subjected to variable magnetic fields, which are used to create effective Hamiltonians or at the saturation of inhomogeneously broadened EPR lines.

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Публикация на русском языке Зобов, Владимир Евгеньевич. О влиянии неоднородного магнитного поля на высокочастотные асимптотики корреляционных функций спиновых решеток [Текст] / В. Е. Зобов, М. М. Кучеров // Письма в Журн. эксперим. и теор. физ. - 2018. - Т. 107 Вып. 9-10. - С. 578-582

Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Space & Informat Technol, Krasnoyarsk 660074, Russia.

Доп.точки доступа:
Kucherov, M. M.; Зобов, Владимир Евгеньевич
}
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Identification of anhydrous CaCl2 and KCaCl3 in natural inclusions by Raman spectroscopy / S. Grishina [et al.] // Chem. Geol. - 2018. - Vol. 493. - P. 532-543, DOI 10.1016/j.chemgeo.2018.07.017. - Cited References: 52. - The manuscript was greatly benefited from revisions of Dr. Matthew Steele-MacInnis and anonymous Reviewer. The authors are grateful to Dr. Sharigin V. for providing the sample and photograph of the chloride segregation from Udachnaya-East pipe, Dr. Mazurov M.P. for providing apatite and forsterite samples and Dr. Polozov A. for drawing the map. The computations were performed using facilities of the Computational Centre of the Research Park of St. Petersburg State University. This work is financially supported by the Russian Foundation for Basic Research (grants 15-05-09345 , 18-05-00682 ) and VEGA grant 1/0560/15. . - ISSN 0009-2541
Кл.слова (ненормированные):
Polymorphs CaCl2 -- Raman spectra -- Magma-salt interaction -- Chlorocalcite -- Daughter mineral -- Ab initio calculations
Аннотация: Anhydrous chlorides - CaCl2, and KCaCl3 (chlorocalcite) were identified as mineral inclusions in halite from the Siberian Large Igneous Province at the contact of magmatic intrusions and evaporates. Chlorocalcite was also found as daughter mineral in polyphase hypersaline inclusions. While Raman spectra of KCaCl3 (chlorocalcite) in natural inclusions are similar to spectra of synthetic analogue, the Raman spectra of natural CaCl2 do not correspond to the published Raman spectra of synthetic CaCl2. Simulations of Raman spectra using ab initio density-functional theory (DFT) allowed us to calculate the spectra of individual polymorphs of CaCl2 and to discriminate anhydrous CaCl2 phases in natural inclusions and synthetic CaCl2. In the spectrum of the Pbcn polymorph of CaCl2 twelve different peaks could be identified at 74, 95, 99, 107, 124, 158, 164, 179, 212, 236, 244, 256 cm−1 in contrast to five peaks in the spectrum of the Pnnm polymorph of CaCl2 at 115, 157, 160, 211 and 252 cm−1. Naturally occurring CaCl2 in inclusions in halite consist of Pbcn polymorph only, which probably results from a mechanical stress on cooling from magmatic to ambient temperatures. However, the Raman spectra of the synthetic CaCl2 corresponds to the Pnnm phase with small contributions of the Pbcn phase. Raman spectra of synthetic KCaCl3 with main peaks at 58, 67, 90, 97, 133, 139, 147, 193 cm−1 agrees well with the spectra of chlorocalcite in the natural inclusions. Positions of each atom in the KCaCl3 structure were refined using the density-functional theory. There are no imaginary phonon modes for the optimized structure, indicating that the structure of KCaCl3 is stable. Calculated Raman spectrum is in a good agreement with the Raman spectrum of synthetic and natural KCaCl3 samples.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Koptuyg Avenue 3, Novosibirsk, Russian Federation
Department of Economic Geology, Comenius University, Faculty of Natural Sciences, Ilkovicova 6, Bratislava, Slovakia
Universite de Lille, CNRS, UMR 8516, LASIR, Laboratoire de Spectrochimie Infrarouge et Raman, Lille, France
Universite de Lorraine, CNRS, CREGU, GeoRessources laboratory (UMR 7359), Vandoeuvre-les-Nancy, BP-70239, France
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodniy 79, Krasnoyarsk, Russian Federation
Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dubravska cesta 9, Bratislava, Slovakia
Ioffe Institute, St. Petersburg, Russian Federation

Доп.точки доступа:
Grishina, S.; Kodera, P.; Uriarte, L. M.; Dubessy, J.; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Goryainov, S.; Simko, F.; Yakovlev, I.; Roginskii, E. M.
}
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Restoration of soft modes in Raman spectra of antiferroeelectric (Pb-La)(Zr-Sn-Ti)O3 ceramics / A. N. Vtyurin [et al.] // Joint 14th Rus./CIS/Baltic/Japan Symp. on Ferroelectricity (RCBJSF)/ Young sci. school on the spect. studies of critical dynamics at struct. phase trans. : Abstract book / org. comm. A. N. Vtyurin ; progr. comm. I. N. Flerov. - 2018. - P. 26. - Cited References: . - ISBN 978-5-9651-1144-2

Материалы конференции

Доп.точки доступа:
Vtyurin, A. N. \org. comm.\; Втюрин, Александр Николаевич; Flerov, I. N. \progr. comm.\; Флёров, Игорь Николаевич; Vtyurin, A. N.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Wei, Xiaoyong; Feng, Yujun; Xu, Ran; Zhao, Tian; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(14 ; May 14-18, 2018 ; St. Perersburg); Young scientists school on the spectroscopic(May 14-18, 2018 ; St. Perersburg); Физико-технический институт им. А.Ф. Иоффе РАН; Санкт-Петербургский политехнический университет им. Петра Великого
}
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Malakhovskii, A. V.
Influence of the low local symmetry of Er3+ ions on magnetic circular dichroism and absorption spectra of f-f transitions in ErFe3(BO3)4 single crystal / A. V. Malakhovskii, V. V. Sokolov, I. A. Gudim // J. Magn. Magn. Mater. - 2018. - Vol. 465. - P. 700-708, DOI 10.1016/j.jmmm.2018.06.057. - Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches grant 16-02-00273 and by the Project of Russian Academy of Science No. 0356-2017-0030. . - ISSN 0304-8853
Кл.слова (ненормированные):
Er3+ ion -- f-f transitions -- Magnetic circular dichroism -- Rare earth ferroborates
Аннотация: Linearly polarized absorption spectra and magnetic circular dichroism (MCD) spectra of ErFe3(BO3)4 single crystal were measured in the range of 9000–23000 cm−1 at 90 K. The absorption spectra of f-f transitions were decomposed into the Lorentz shape components and intensities of the components were found. MCD spectra permitted us to measure the Zeeman splitting of some transitions and so to determine changes of the Landé factor along the C3 axis of the crystal during these transitions. Optical and magneto-optical properties of f-f transitions in the ErFe3(BO3)4 crystal were compared with those in the ErAl3(BO3)4 crystal. Substantial difference of the properties connected with the difference of the Er3+ ions local symmetry in two crystals was revealed. Large splitting of one of the f-f transitions without magnetic field, which is not possible for the Kramers doublets, was observed. It was explained by appearance of two absorbing centers due to the local decrease of symmetry in the excited state. Appreciable difference of the local vibrations energy in some excited states was revealed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Gudim, I. A.; Гудим, Ирина Анатольевна; Малаховский, Александр Валентинович
}
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10.

Magnetic resonance studies of mixed chalcospinel CuCr2SxSe4−x (x = 0; 2) and CoxCu1−xCr2S4 (x = 0.1; 0.2) nanocrystals with strong interparticle interactions / A. I. Pankrats [et al.] // J. Magn. Magn. Mater. - 2018. - Vol. 452. - P. 297-305, DOI 10.1016/j.jmmm.2017.12.092. - Cited References: 31. - The authors thank D.A. Balaev for fruitful and useful discussions. The work at the University of Alabama was supported by the National Science Foundation, United States under Grant No. CHE-1508259. . - ISSN 0304-8853
Кл.слова (ненормированные):
Freezing temperatures -- Individual nanoparticles -- Inhomogeneous broadening -- Inter-particle interaction -- Magnetic dipolar field -- Magnetic resonance spectra -- Nano-sized crystallites -- Resonance characteristic
Аннотация: Magnetic resonance characteristics of mixed chalcospinel nanocrystals CuCr2SxSe4−x (x = 0 and 2) and CoxCu1−xCr2S4 (x = 0.1 and 0.2) have been investigated. It has been established based on TEM, SEM and resonance data that all the samples contain both blocks with sizes from 1 to 50 m of compacted nanosized crystallites and individual nanoparticles with sizes from 10 to 30 nm. The studies provide evidence of strong interparticle interaction in all the samples leading to high values of the blocking temperature. Magnetic dipolar field arise in the boundary regions of interacting adjacent nanocrystals below the blocking temperature. This results in inhomogeneous broadening of the magnetic resonance spectrum along with appearance of additional absorption lines. With increase in magnetic anisotropy at low temperatures, a shift of the resonance field along with line broadening are observed for all the studied compounds due to freezing of the moments in the nanoparticles, both in the individual and compacted ones. A gapped characteristic of the resonance spectrum is established below the freezing temperature Tfr, with the energy gap defined by the averaged magnetic anisotropy . Anionic substitution of sulfur by selenium results in a decrease in the magnetic anisotropy. In contrast, cationic substitution of copper by cobalt increases the magnetic anisotropy due to a strong contribution from the latter ion.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
UbiQD, LLC, 134 Eastgate Dr, Los Alamos, NM, United States
MINT Center, The University of Alabama, Tuscaloosa, AL, United States

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Tugarinov, V. I.; Тугаринов, Василий Иванович; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Ramasamy, K.; Gupta, A.
}
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11.

    Thiobarbiturate and barbiturate salts of pefloxacin drug: Growth, structure, thermal stability and IR-spectra / N. N. Golovnev [et al.] // J. Mol. Struct. - 2017. - Vol. 1149. - P. 367-372, DOI 10.1016/j.molstruc.2017.08.011. - Cited References: 41. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation to the Siberian Federal University (4.7666.2017/BP) in 2017–2019. The reported study was funded by RFBR according to the research project 16-52-48010 and 17-52-53031. The X-ray data from single crystals were obtained with the use of the analytical equipment of the SB RAS Baikal Collective Use Center and using the analytical equipment of the SB RAS Krasnoyarsk Collective Use Center. . - ISSN 0022-2860
   Перевод заглавия: Тиобарбитуровая и барбитуровая соли пефлоксацина: Синтез, структура, термическая стабильность и ИК-спектры
Кл.слова (ненормированные):
Thiobarbituric acid -- Barbituric acid -- Pefloxacin -- X-ray diffraction -- Infrared spectroscopy -- Salts -- Thermal stability
Аннотация: Three new salts of pefloxacin (PefH) with thiobarbituric (H2tba) and barbituric (H2ba) acids, pefloxacinium 2-thiobarbiturate trihydrate, PefH2(Htba)·3H2O (1), pefloxacinium 2-thiobarbiturate, PefH2(Htba) (2) and bis(pefloxacinium barbiturate) hydrate, (PefH2)2(Hba)2·2.56H2O (3) are synthesized and structurally characterized by the X-ray single-crystal diffraction. The structures of 1–3 contain intramolecular hydrogen bonds C–H⋯F, O–H⋯O. Intermolecular hydrogen bonds N–H⋯O and O–H⋯O form a 2D plane network in 1. In 2 and 3, intermolecular hydrogen bonds N–H⋯O form the infinite chains. In 1–3, the Htba− and Hba− ions are connected with PefH2 + only by one intermolecular hydrogen bond N–H⋯O. In 2 and 3, two Htba− and Hba− ions are connected by two hydrogen bonds N–H⋯O. These pairs form infinite chains. All three structures are stabilized by the π−π interactions of the head-to-tail type between PefH2 + ions. Compounds 2 and 3 are characterized by powder XRD, TG-DSC and FT-IR.

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Держатели документа:
Siberian Federal University, 79 Svobodny Ave.Krasnoyarsk, Russian Federation
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Bld. 38 Akademgorodok 50Krasnoyarsk, Russian Federation
Department of Physics, Far Eastern State Transport University, 47 Seryshev Str.Khabarovsk, Russian Federation
Laboratory of Physical Chemistry, Irkutsk Favorsky Institute of Chemistry, SB RAS, 1 FavorskyIrkutsk, Russian Federation
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, SB RASNovosibirsk, Russian Federation
Laboratory of Semiconductor and Dielectric Materials, Novosibirsk State UniversityNovosibirsk, Russian Federation

Доп.точки доступа:
Golovnev, N. N.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Lesnikov, M. K.; Sterkhova, I. V.; Atuchin, V. V.
}
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12.

Pyatnov, M. V.
Localized optical modes in a defect-containing liquid-crystal structure adjacent to the metal / M. V. Pyatnov, S. Ya. Vetrov, I. V. Timofeev // J. Opt. Soc. Am. B. - 2017. - Vol. 34, Is. 9. - P. 2011-2017, DOI 10.1364/JOSAB.34.002011. - Cited References: 44. - Russian Foundation for Basic Research (RFBR), Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund (17-42-240464). . - ISSN 0740-3224
Кл.слова (ненормированные):
Cholesteric liquid crystals -- Crystal defects -- Defects -- Liquid crystals -- Liquids -- Metals -- Optical Kerr effect -- Polarization -- Diffraction reflections -- External fields -- Field localization -- Maximum field intensity -- Metallic layers -- Polarization dependence -- Spectral properties -- Transmittance spectra -- Crystal structure
Аннотация: The possibility of the existence of localized optical modes with maximum field intensity at the interface between the metal and cholesteric liquid crystal is theoretically grounded. The system comprises a defect-containing cholesteric liquid crystal and a metal layer. It is established that the localization occurs at almost any defect thickness rather than only at the half-wave thickness, at which the loss of the polarization dependence of diffraction reflection and the absence of field localization are observed for the structure without the metallic layer. It is demonstrated that the spectral properties can be controlled by external fields affecting the liquid crystal. At large thicknesses of the cholesteric liquid crystal between the defect and the metallic layer, the spectrum contains the pronounced peaks corresponding to the edge modes. The results obtained open new opportunities for controlling the transmittance spectrum, polarization, and localization of light in optoelectronic elements based on the investigated system. © 2017 Optical Society of America.

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Держатели документа:
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Laboratory of Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович
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13.

Low-temperature absorption spectra and electron structure of HoFe3(BO3)4 single crystal / A. V. Malakhovskii [et al.] // Low Temp. Phys. - 2017. - Vol. 43, Is. 5. - P. 610-616, DOI 10.1063/1.4985208. - Cited References: 33 . - ISSN 1063-777X
Аннотация: Polarized absorption spectra of HoFe3(BO3)4 single crystal in the range of 8500-24 500 cm-1 were studied as a function of temperature beginning from 2K. The ground and excited electron states of Ho3+ were identified. The abrupt changes of the spectra at the reorientation phase transition at 4.7K were observed. The exchange splitting of some excited states were revealed and measured. They changed at the reorientation phase transition. Several vibronic transitions were observed. The splitting of absorption lines corresponding to the C2 local symmetry of the Ho ion was not observed. Moreover, spectra of some absorption bands correspond to splitting in the cubic crystal field. There are some absorption lines, whose polarization cannot be explained both in D3 and C2 local symmetries. Some lines appear or disappear as a result of the transition from the easy axis to the easy plane state of the crystal. All these observations testify to the substantial changes of the local magnetic and structural properties in the excited states of the Ho3+ ion and to the strong influence of the magnetic moments orientation on the polarization of the electron transitions.

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Публикация "на русском языке" Low-temperature absorption spectra and electron structure of HoFe3(BO3)4 single crystal [Текст] / A. V. Malakhovskii [et al.] // Физ. низких температур : Физико-технический институт низких температур им. Б. И. Веркина НАН Украины, 2017. - Т. 43 Вып. 5.- С.764-771

Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Gudim, I. A.; Гудим, Ирина Анатольевна
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14.

Raman scattering and phase transitions in fluorides with elpasolite structure / A. Vtyurin [et al.] // Ferroelectrics : Proceedings of the Joint International Symposium. - 2017. - Vol. 512, Is. 1. - P. 58-64, DOI 10.1080/00150193.2017.1349863. - Cited References: 22 . - ISSN 0015-0193
Кл.слова (ненормированные):
Ferroelectric materials -- Ferroelectricity -- Elpasolite -- First-order phase transitions -- Fluorescence process -- Raman lines -- Raman scattering spectra -- Temperature phase -- Temperature range -- Raman scattering
Аннотация: Raman scattering spectra of Rb2KHoF6 and Rb2KDyF6 crystals have been studied in temperature range from 20 K to 399 K and from 7 K to 500 K respectively. Raman spectra of Rb2KHoF6 crystal are distorted due to the fluorescence process. Parameters of Raman lines have been quantitatively analyzed. The investigation points to the considerable role of CX6 groups in the temperature phase transition in Rb2KHoF6 and Rb2KDyF6 crystals. The anomalies of spectra changes with temperature testify the first order phase transitions in these crystals. © 2017 Taylor & Francis Group, LLC.

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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(13 ; 2016 ; June 19-24 ; Matsue, Japan); International Workshop on Relaxor Ferroelectrics(8 ; June 19-24, 2016 ; Matsue, Japan)
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15.

Transformation of HoFe3(BO3)4 absorption spectra at reorientation phase transitions / A. V. Malakhovskii [et al.] // Second Int. Workshop "Novel Trends in Physics of Ferroics" : abstracts. - 2017. - P. 60

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Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Gudim, I. A.; Гудим, Ирина Анатольевна; Novel Trends in Physics of Ferroics, International Workshop (2 ; 2017, July 6-8 ; St. Petersburg, Russia); "Новые направления в развитии физики ферроиков", международный семинар(2 ; 2017, Июль, 6-8 ; Санкт-Петербург); Физико-технический институт им. А.Ф. Иоффе РАН
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16.

Orientational disorder and phase transitions in ammonium oxofluorovanadates, (NH4)3VOF5 and (NH4)3VO2F4 / A. A. Udovenko [и др.] // Acta Crystallogr. B. - 2017. - Vol. B73. - P. 1085-1094, DOI 10.1107/S2052520617012422. - Cited References: 50. - We thank A. S. Krylov for recording the Raman spectra of (NH4)3VOF5 and A. M. Ziatdinov for recording the EPR spectra. . - ISSN 2052-5206
Кл.слова (ненормированные):
ammonium oxofluorovanadates -- phase transitions -- crystal structure -- dynamic orientational disorder -- electron-density profiles -- differential scanning microcalorimetry -- vibrational spectra
Аннотация: Single crystals of (NH4)3VOF5 and (NH4)3VO2F4 were obtained from aqueous fluoride solutions and phase transitions in these compounds were investigated using X-ray diffraction, differential scanning microcalorimetry (DSM) and vibrational spectroscopy. The room-temperature (RT) phases of these compounds belong to orthorhombic symmetry [Immm and I222, Z = 6, for (NH4)3VOF5 and (NH4)3VO2F4, respectively] with similar unit-cell parameters and two independent vanadium atoms. Above RT [at 350 and 440 K for (NH4)3VOF5 and (NH4)3VO2F4, respectively], the compounds undergo reversible phase transitions into high-symmetry dynamically disordered elpasolite-like (Fm3m, Z = 4) structures with six and 12 spatial orientations of the vanadium octahedron for (NH4)3VOF5 and (NH4)3VO2F4, respectively. The ligand atoms are distributed in a mixed (split) position of 24e + 96j, one of the ammonium groups is disordered on the tetrahedron 32f site, but another one forms eight spatial orientations due to disorder of its hydrogen atoms in the 96j position. DSM and spectroscopic data enable the phase transition from high temperature to room temperature to be connected with the transition from isotropic orientations of the octahedron to its two different dynamic states.

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Держатели документа:
Institute of Chemistry FEB RAS, 159 Pr. Stoletiya Vladivostoka, Vladivostok, 690022, Russian Federation
Kirensky Institute of Physics, Siberian Branch of RAS, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Udovenko, A. A.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Marchenko, Yu. V.; Laptash, N. M.
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17.

Transformation of the HoFe3(BO3)4 absorption spectra at reorientation magnetic transitions and local properties in the excited 5F5 states of the Ho3+ ion / A. V. Malakhovskii [et al.] // Phys. Rev. B. - 2017. - Vol. 96, Is. 22. - Ст. 224430, DOI 10.1103/PhysRevB.96.224430. - Cited References: 27. - A.V.M. Malakhovskii acknowledges the support from the Russian Foundation for Basic Researches Grant No. 16-02-00273 and the President of Russia Grant No. Nsh-7559.2016.2. . - ISSN 2469-9950
Аннотация: Polarized absorption spectra of the 5I8→5F5 transition of the Ho3+ ion in the HoFe3(BO3)4 single crystal were measured at T=2K as a function of magnetic field 0–60 kOe directed along the a, b, and c axes of the crystal. The spin-reorientation transitions were observed in the field H∥c at 5.35 kOe, in the field H∥a at 10.25 kOe, and in the field H∥b at 9.1 kOe. We also observed a small hysteresis of the transitions. We found that the optical properties of the crystal change as a function of the magnetic field orientation in the basal plane in spite of the nominally axial symmetry of the crystal. We found a number of specific local properties in the Ho3+ excited states. Nonequivalent positions of the Ho3+ ion appear in some excited states. It was shown that during one of the electron transitions the local symmetry changes not only in the excited state but in the ground state as well. We observed local metamagnetic transitions in some Ho3+ excited states. In some excited states, the Ho3+ ion is in the easy-plane state while the total crystal is in the easy-axis state and vice versa. This means that the magnetic moments of the Fe3+ and Ho3+ ions in these excited states of the Ho3+ ions are mutually perpendicular. Such phenomenon testifies to the existence of the antisymmetric Fe-Ho exchange interaction in the Ho3+ excited states.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov, Ukraine

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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18.

    Sokolov, V. V.
    Magnetic circular dichroism spectra and electron structure of ErAl3(BO3)4 single crystal / V. V. Sokolov, A. V. Malakhovskii, I. A. Gudim // Moscow Int. Symp. on Magnet. (MISM-2017) : 1-7 July 2017 : book of abstracts / чл. междунар. конс. комитета С. Г. Овчинников ; чл. нац. конс. комитета Н. В. Волков. - 2017. - Ст. 32PO-12-5. - P. 588. - Cited References: 1
   Перевод заглавия: Московский международный симпозиум по магнетизму

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Доп.точки доступа:
Овчинников, Сергей Геннадьевич \чл. междунар. конс. комитета\; Ovchinnikov, S. G.; Волков, Никита Валентинович \чл. нац. конс. комитета\; Volkov, N. V.; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gudim, I. A.; Гудим, Ирина Анатольевна; Соколов, Валерий Владимирович; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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19.

    In-situ Raman study of phengite compressed in water medium under simultaneously high P-T parameters / S. V. Goryainov [et al.] // J. Raman Spectrosc. - 2017. - Vol. 48, Is. 11. - P. 1431-1437, DOI 10.1002/jrs.5112. - Cited References:57. - This work was supported by the Russian Science Foundation (Grant No. 15-17-30012) . - ISSN 0377-0486. - ISSN 1097-4555
   Перевод заглавия: Исследование фенгита в сжатом состоянии в водной среде при одновременном высоком параметре P-T методом комбинационного расеяния света

РУБ Spectroscopy
Рубрики:
X-RAY-DIFFRACTION
HYDROGEN-BOND DIMERS
POLARIZED IR-SPECTRA
Кл.слова (ненормированные):
Raman spectra -- phengite -- high pressure -- high temperature -- diamond anvil -- cell
Аннотация: The in-situ method of Raman spectroscopy was used to study the layered mineral phengite, K(Al,Mg)2(Si,Al)4O10(OH)2, compressed in water under simultaneously high temperatures and pressures (respectively, up to 373 °С and 12.5 GPa). The implemented conditions were typical of modeling the ‘cold’ subduction zones in lithospheric slabs. The high pressures and temperatures were produced in an electrically heated diamond-anvil cell. Measured Raman spectra have demonstrated a high Р–Т stability of the mineral. No non-quenchable phengite states (no reversible or irreversible polymorphic transitions, overhydration or notable amorphization) were observed in the investigated samples.

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Доп.точки доступа:
Goryainov, S. V.; Горяйнов, Сергей Владимирович; Krylov, A. S.; Крылов, Александр Сергеевич; Polyansky, O. P.; Полянский, О. П.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Science Foundation [15-17-30012]; International GeoRAMAN Conference(12th ; June 9-15, 2016 ; Novosibirsk, Russia)
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20.

The magnon mode in Raman spectra of the antiferromagnetic α-MnS / G. M. Abramova [et al.] // International Symposium "Spin Waves 2018" : Program. - 2018. - Sec. 3: Magnonics and propagation of spin waves. - 3-1.

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Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Kolesov, B.; Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Vtyurin, A. N.; Втюрин, Александр Николаевич; Российская академия наук; Физико-технический институт им. А.Ф. Иоффе РАН; "Spin Waves", International Symposium(2018 ; июнь ; 3-8 ; Санкт-Петербург)
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