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Exchange interaction between excited states of magnetic ions / S. G. Ovchinnikov, V. A. Gavrichkov, S. I. Polukeev, A. V. Malakhovskii // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст. H.I1. - P. 36-37. - Cited References: 8. - Support by RSF grant 18-12-00022 is acknowledged . - ISBN 978-5-9500855-7-4

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

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Ovchinnikov, S. G.; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Polukeev, S. I.; Полукеев, Семен Игоревич; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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    Multiple substitution strategies toward tunable luminescence in Lu2MgAl4SiO12:Eu2+ phosphors / Z. Ming, J. Qiao, M. S. Molokeev [et al.] // Inorg. Chem. - 2020. - Vol. 59, Is. 2. - P. 1405-1413, DOI 10.1021/acs.inorgchem.9b03142. - Cited References: 31. - This research is supported by the National Natural Science Foundation of China (Grants 51972118, 51722202, and 51572023), Natural Science Foundations of Beijing (Grant 2172036), and Fundamental Research Funds for the Central Universities (Grant FRF-TP-18-002C1) . - ISSN 0020-1669. - ISSN 1520-510X
   Перевод заглавия: Стратегии множественного замещения для перестраиваемой люминесценции в люминофорах Lu2MgAl4SiO12:Eu2+
Рубрики:
Physical and chemical processes
   Phosphors
   Luminescence
   Cations
   Ions
Аннотация: The equivalent or heterovalent substitution strategy is an efficient way to stimulate photoluminescence tuning or to optimize the luminescence performances of phosphor materials. Garnet-type compounds receive much attention as phosphor hosts because of their flexible structural frameworks. Herein, a garnet-type Lu2MgAl4SiO12:Eu2+ phosphor with broad-band blue-green emission is first explored with two-site occupation by varying the Eu2+ content. Two host-substitution approaches to controlling the luminescence behavior of Lu2MgAl4SiO12:Eu2+ phosphor are implemented. The cation substitution strategy of Ca2+ for Mg2+ achieves tunable emission from 463 to 503 nm together with broadening emission bands in Lu2Mg1–yCayAl4SiO12:Eu2+ phosphors. Moreover, chemical unit cosubstitution of [Ca2+–Ge4+] replacing [Lu3+–Al3+] results in Lu2–zCazMgAl4–zGezSiO12:Eu2+ phosphors, which induce a red shift of the emission peak of about 60 nm and a broadening in the emission spectra with increasing Ca2+ and Ge4+ concentrations. The possible photoluminescence tuning mechanism is ascribed to the coordination sphere variation in the EuO8 polyhedron depending on the changing neighboring cations. The proposed approaches on equivalent or heterovalent substitution can contribute to the development of Eu2+-activated garnet-type phosphors with regulation of the luminescence performance and further initiate research discovering new phosphors for white-light-emitting diodes.

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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russia
Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein, 9300, South Africa
State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China

Доп.точки доступа:
Ming, Zhiqiang; Qiao, Jianwei; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Swart, Hendrik C.; Xia, Zhiguo
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    Pressure-Induced Structural Transition to the Polar Phase in GdFe3(BO3)4 / I. S. Lyubutin [et al.] // Cryst. Growth Des. - 2019. - Vol. 19, Is. 12. - P. 6935-6944, DOI 10.1021/acs.cgd.9b00609. - Cited References: 39. - The authors express their deep gratitude to Prof. S. G. Ovchinnikov for initiating this work and fruitful discussions. These studies were performed with the support of the Ministry of Science and Higher Education within the State assignment FSRC "Crystallography and Photonics" RAS in part for the synchrotron Mössbauer measurements. Support from RFBR Grant No. 17-02-00766 in part for the Raman spectroscopy measurements and from No. 18-02-00696 in part for the theoretical calculations is also acknowledged. For preparation and tests of high-pressure cells, (39) the facilities of Center for Collective Use “Accelerator Center for Neutron Research of the Structure of Substance and Nuclear Medicine” of the INR RAS were used. . - ISSN 1528-7483
   Перевод заглавия: Индуцированный давлением структурный переход в полярную фазу в GdFe3(BO3)4
Кл.слова (ненормированные):
Boron -- Crystal lattices -- Ferroelectricity -- Ions -- Iron compounds
Аннотация: The GdFe3(BO3)4 crystal has attracted great interest as a magnetic-field-induced multiferroic. In this paper, we show that the multiferroic properties in this crystal can be induced by high pressure. At high pressures up to 50 GPa, created in diamond anvil cells, the structural and vibrational (phonon) properties of the GdFe3(BO3)4 crystal were studied. The structural phase transition was detected at about 23–25 GPa by Raman and synchrotron Mössbauer (NFS) spectroscopy. First-principle calculations of the crystal lattice dynamics at pressures below and above the structural transition were carried out. It was established that at pressures above the structural transition, the space group R32 of GdFe3(BO3)4 is changed to the polar space group R3, and the crystal becomes a ferroelectric. At the R32 → R3 transition, the displacement of the boron ion B(2) and oxygen O results in the formation of boron–oxygen B(2)O4 tetrahedrons instead of the plane BO3 triangles. Meanwhile, the triangle oxygen environment of boron in the site B(1) remains unchanged. The nearest environment of the gadolinium ion also changes significantly. Instead of six oxygen ions in the R32 phase, the nearest surroundings of Gd in the R3 phase consist of nine oxygen ions forming a complex polyhedron. A large hysteresis of the transition indicates that this crystal remains a ferroelectric with a decrease in pressure to about ambient pressure.

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Держатели документа:
Shubnikov Institute of Crystallography of FSRC Crystallography and Photonics RAS, Moscow, 119333, Russian Federation
Institute for Nuclear Research, Russian Academy of Sciences, Troitsk, Moscow, 108840, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
REC Functional Nanomaterials, Immanuel Kant Baltic Federal University, Kaliningrad, 236041, Russian Federation

Доп.точки доступа:
Lyubutin, I. S.; Gavriliuk, A. G.; Andryushin, N. D.; Андрюшин, Никита Дмитриевич; Pavlovskiy, M. S.; Павловский, Максим Сергеевич; Zinenko, V. I.; Зиненко, Виктор Иванович; Lyubutina, M. V.; Troyan, I. A.; Smirnova, E. S.
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High-resolution optical spectroscopy and modeling of spectral and magnetic properties of multiferroic ErFe3(BO3)4 / M. N. Popova, E. P. Chukalina, D. S. Erofeev [et al.] // Phys. Rev. B. - 2020. - Vol. 101, Is. 20. - Ст. 205108, DOI 10.1103/PhysRevB.101.205108. - Cited References: 38. - Financial support of the Russian Science Foundation under Grant No. 19-12-00413 is acknowledged. . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
F-F TRANSITIONS
   ENERGY-LEVELS
   ER3+ IONS
   GROWTH
Аннотация: We carried out the high-resolution broadband temperature-dependent polarized optical spectroscopy and theoretical studies of ErFe3(BO3)4 single crystals in the paramagnetic and antiferromagnetic (T˂TN=39K) phases. On the basis of the experimentally determined 45 crystal-field (CF) levels of Er3+ ions at sites with the C2 point symmetry, CF calculations were performed, a set of physically grounded CF parameters was obtained and used to model the temperature dependences of the Er magnetic moments measured in neutron-scattering experiments, as well as the magnetic susceptibility and magnetization of the compound; the contributions of the quasi-one-dimensional iron magnetic subsystem were calculated in the frame of the previously developed self-consistent four-particle cluster model. The modeling strongly supports an easy-plane collinear structure of iron magnetic moments and excludes earlier proposed additional magnetic phase.

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Держатели документа:
Russian Acad Sci, Inst Spect, Moscow 108840, Russia.
Natl Res Univ, Moscow Inst Phys & Technol, Dolgoprudnyi 141701, Moscow Region, Russia.
LV Kirenskii Inst Phys, Siberian Branch RAS, Krasnoyarsk 660036, Russia.
Kazan Fed Univ, Kazan 420008, Russia.

Доп.точки доступа:
Popova, M. N.; Chukalina, E. P.; Erofeev, D. S.; Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна; Malkin, B. Z.; Russian Science FoundationRussian Science Foundation (RSF) [19-12-00413]
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    Incorporating rare-earth terbium(III) Ions into Cs2AgInCl6:Bi nanocrystals toward tunable photoluminescence / Y. Liu, X. M. Rong, M. Z. Li [et al.] // Angew. Chem. - Int. Edit. - 2020. - Vol. 59, Is. 28. - P. 11634-11640, DOI 10.1002/anie.202004562. - Cited References: 43. - This work is supported by the National Natural Science Foundation of China (51961145101, 51972118 and 51722202), Fundamental Research Funds for the Central Universities (FRFTP-18-002C1), Guangdong Provincial Science & Technology Project (2018A050506004) and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-52-80003. . - ISSN 1433-7851. - ISSN 1521-3773
   Перевод заглавия: Включение редкоземельного тербия (III) в нанокристаллы Cs2AgInCl6: Bi для перестраиваемой фотолюминесценции

РУБ Chemistry, Multidisciplinary
Рубрики:
HALIDE DOUBLE PEROVSKITE
   LEAD-FREE
   LANTHANIDE
   STABILITY
   EMISSION
Кл.слова (ненормированные):
doping -- energy transfer -- perovskite nanocrystals -- photoluminescence -- terbium
Аннотация: The incorporation of impurity ions or doping is a promising method for controlling the electronic and optical properties and the structural stability of halide perovskite nanocrystals (NCs). Herein, we establish relationships between rare‐earth ions doping and intrinsic emission of lead‐free double perovskite Cs2AgInCl6 NCs to impart and tune the optical performances in the visible light region. Tb3+ ions were incorporated into Cs2AgInCl6 NCs and occupied In3+ sites as verified by both crystallographic analyses and first‐principles calculations. Trace amounts of Bi doping endowed the characteristic emission (5D4→7F6‐3) of Tb3+ ions with a new excitation peak at 368 nm rather than the single characteristic excitation at 290 nm of Tb3+. By controlling Tb3+ ions concentration, the emission colors of Bi‐doped Cs2Ag(In1−x Tbx )Cl6 NCs could be continuously tuned from green to orange, through the efficient energy‐transfer channel from self‐trapped excitons to Tb3+ ions. Our study provides the salient features of the material design of lead‐free perovskite NCs and to expand their luminescence applications.

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Держатели документа:
Univ Sci & Technol Beijing, Beijing Municipal Key Lab New Energy Mat & Techno, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
Shenzhen Univ, Shenzhen Key Lab Special Funct Mat, Shenzhen Engn Lab Adv Technol Ceram, Guangdong Res Ctr Interfacial Engn Funct Mat,Coll, Shenzhen 518060, Peoples R China.
Fed Res Ctr KSC SB RASs, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Engn Phys & Radioelect, Krasnoyarsk 660041, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangdong Prov Key Lab Fiber Laser Mat & Appl Tec, Sch Mat Sci & Technol, Guangzhou 510641, Peoples R China.

Доп.точки доступа:
Liu, Ying; Rong, Ximing; Li, Mingze; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhao, Jing; Xia, Zhiguo
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Orlov, Yu. S.
Magnetic properties and spin crossover in transition metal oxides with d5 Ions at high pressures / Y. S. Orlov, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2019. - Vol. 129, Is. 6. - P. 1062-1069, DOI 10.1134/S1063776119120185. - Cited References: 33. - This study was supported by the Russian Science Foundation (project no. 18-12-00022) . - ISSN 1063-7761
Кл.слова (ненормированные):
Antiferromagnetic materials -- Antiferromagnetism -- Chemical bonds -- Elasticity -- Electronic states -- Ferromagnetic materials -- Ferromagnetism -- Magnetic properties -- Paramagnetism -- Phase diagrams -- Transition metals
Аннотация: We analyze the influence of cooperative effects on the magnetic properties and spin crossover between the high-spin (HS) term S = 5/2 and low-spin (LS) term S = 1/2 in Mott–Hubbard dielectrics with 3d5 ions under high pressures. Two cooperation mechanisms (superexchange interaction and effective interaction via the elastic system) are considered. The sign of the exchange interaction changes because of the crossover from the antiferromagnetic in the HS state to the ferromagnetic in the LS state. In view of the large difference between the ionic radii of the HS and LS states, the systems with spin crossover acquire an additional strong coupling via the elastic system. Using the Hubbard operator representation and considering the electronic states of the two terms simultaneously, we obtain the effective Hamiltonian with allowance for the cooperative effects. The magnetic phase diagram and the spin crossover are investigated in the mean field approximation. It is shown that the inclusion of cooperative effects at low temperatures leads to a first-order phase transition between the antiferromagnetic HS state and the ferromagnetic LS state. At higher temperatures, more complicated sequences of phase transitions are possible upon an increase in pressure, including the HS paramagnet–HS antiferromagnet–LS paramagnet and HS antiferromagnet–LS paramagnet–LS ferromagnet transitions.

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Публикация на русском языке Орлов, Юрий Сергеевич. Магнитные свойства и спиновый кроссовер при высоких давлениях в окислах переходных металлов с d5-ионами [Текст] / Ю. С. Орлов, С. В. Николаев, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 2019. - Т. 156 Вып. 6. - С. 1165-1174

Исправлено Orlov Yu. S. Erratum to: Magnetic properties and spin crossover in transition metal oxides with d5 ions at high pressures [Текст] / Y. S. Orlov, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2020. - Vol. 131 Is. 2.- P.374-374

Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center,” Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Орлов, Юрий Сергеевич
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Spin state of iron ions in Bi2(Sn1−xFex)2O7 / L. V. Udod [et al.] // VII Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2019) : Book of abstracts. - 2019. - Vol. 2. - Ст. K.P19. - P. 352-353. - References:

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Romanova, O. B.; Романова, Оксана Борисовна; Bayukov, O. A.; Баюков, Олег Артемьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований
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Investigation of the Magnetic Properties of Ludwigites / R. M. Eremina [et al.] // Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P. 912-914, DOI 10.3103/S1062873819070141. - Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project no. 17-02-00953. . - ISSN 1062-8738
Кл.слова (ненормированные):
Aluminum compounds -- Copper compounds -- Gallium compounds -- Magnetic susceptibility -- Metal ions -- Single crystals -- Temperature distribution -- X ray powder diffraction
Аннотация: Single crystals of Cu2AlBO5 and Cu2GaBO5 copper oxyborates are synthesized via solution-melt crystallization and subjected to X-ray diffraction analysis. Parameters of the crystal lattice and the positions of atoms in a unit cell are determined. Copper ions form a structural chain along axis а in Cu2AlBO5 and Cu2GaBO5. Temperature dependences of the magnetic susceptibility are measured. The obtained curves feature kinks at Т = 2.4 (Cu2AlBO5) and 4.1 K (Cu2GaBO5). © 2019, Allerton Press, Inc.

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Публикация на русском языке Исследование магнитных свойств людвигитов [Текст] / Р. М. Еремина [и др.] // Изв. РАН. Сер. физич. - 2019. - Т. 83 № 7. - С. 999-1002

Держатели документа:
Zavoisky Physical-Technical Institute, Kazan Scientific Center, Russian Academy of Sciences, Kazan, 420029, Russian Federation
Kazan Federal University, Kazan, 420008, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Eremina, R. M.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Gavrilova, T. P.; Gilmutdinov, I. F.; Sofronova, S. N.; Софронова, Светлана Николаевна; Kiiamov, A. G.
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Influence of cation substitution on dielectric and electric properties of bismuth stannates Bi2Sn1.9Meo.1O7 (Me=Cr, Mn) / S. S. Aplesnin [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. : IOP, 2019. - Vol. 467: 21st International Scientific Conference Reshetnev Readings 2017 (8 November 2018 through 8 November 2018) Conference code: 144163, Is. 1, DOI 10.1088/1757-899X/467/1/012014. - Cited References: 9. - This study was supported by the Russian Foundation for Basic Research project N 17-32-50080, the state order № 3.5743.2017/6.7.
Кл.слова (ненормированные):
Activation energy -- Capacitance -- Chromium -- Current voltage characteristics -- Dielectric losses -- Ions -- Manganese
Аннотация: The article studies effect of nonstoichiometric substitution of the tin ions by chromium and manganese ions on the dielectric and electrical properties of bismuth pyrostannate. The research performs measurements of the current-voltage characteristics, capacitance and tangent of the dielectric loss angle in the temperature range from 300 to 800 K; it finds a qualitative difference in the temperature behavior of the permittivity of bismuth pyrostannate with chromium and manganese ions. A change in the type of conductivity from hopping to tunneling emission is established. The change in the activation energy as a function of the ion radius is found.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Federal Research Center Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Loginov, Y. Y.; Kretinin, V. V.; Masyugin, A. N.; International Scientific Conference Reshetnev Readings 2017(21st ; 8 November 2018 ; Krasnoyarsk, Russian Federation)
}
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10.

    Exchange Interaction between the Excited States of Magnetic Ions / S. G. Ovchinnikov [et al.] // Phys. Metals Metallogr. - 2019. - Vol. 120, Is. 13. - P. 91-94, DOI 10.1134/S0031918X19130210. - Cited References: 11. - This work was supported by the Russian Science Foundation, project no. 18-12-00022. . - ISSN 0031-918X. - ISSN 1555-6190
   Перевод заглавия: Обменное взаимодействие между магнитными ионами в возбужденном состоянии
Кл.слова (ненормированные):
exchange interaction -- spin crossover -- exchange in an excited state
Аннотация: Within the framework of the LDA + GTB multi-electron approach to the electron structure of Mott–Hubbard insulators a scheme is developed for constructing the effective low-energy Hamiltonian that includes not only the ground state of the magnetic cation, but also the excited terms. The mathematical apparatus of the theory are Hubbard operators built on the many-electron states of the cation in the dn configuration. The occupation of the excited term under optical pumping can change the sign of the exchange interaction of the excited cation with the neighboring cation in the ground state. Another variant of the occupation of the excited states is connected with a spin crossover when the excited and the ground terms change over, for example, at high pressure. Examples are given for such crystals as FeBO3, Nd0.5Gd0.5Fe3(BO3)4 and NiO.

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Держатели документа:
L.V. Kirensky Institute of Physics of SB of RAS, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Polukeev, S. I.; Полукеев, Семен Игоревич; Malakhovskii, A. V.; Малаховский, Александр Валентинович
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11.

Forming a ferrimagnetic-like structure in the PbMn1−xFexBO4 (x ≈ 0.1) single crystal upon partial substitution / A. Pankrats [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 497. - Ст. 165997, DOI 10.1016/j.jmmm.2019.165997. - Cited References: 25. - The authors are grateful to S. Nikitin for help in the specific heat measurements in a magnetic field and S. Martynov for fruitful discussions. This study was funded by RFBR and the Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science , to the research project no. 18-42-240008 “Effect of Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Ions Pb 2+ and Bi 3+”. . - ISSN 0304-8853
Кл.слова (ненормированные):
Crystal structure -- Ferrimagnetism -- Ferromagnetic materials -- Ferromagnetic resonance -- Ferromagnetism -- Iron -- Magnetic anisotropy -- Magnetic moments -- Manganese -- Metal ions -- Single crystals -- Specific heat of solids
Аннотация: The PbMn1−xFexBO4 (x ≈ 0.1) orthoborate single crystals have been grown for the first time by spontaneous crystallization and their magnetic and resonance properties and specific heat have been examined. It has been established that partial substitution of iron ions for manganese ones leads to an increase in the Curie temperature to 34.2 K from its value of 30.3 K in the unsubstituted crystal, enhances the magnetic anisotropy, and reduces the saturation magnetization. The magnetization drop is explained in the framework of the model of a ferrimagnetic-like structure, in which the magnetic moments of iron and manganese ions form ferromagnetic subsystems coupled by the antiferromagnetic exchange. It has been found that under magnetization along the rhombic b axis the magnetic moments switch stepwise to the magnetic field direction in a certain critical field. The spin-reorientation transition is the first-order one. This feature of the crystal magnetization does not allow the experimental ferromagnetic resonance frequency-field dependence for the rhombic b axis to be described using the calculation for a simple rhombic ferromagnet. It has been established that the increase in the magnetic anisotropy of the crystal upon substitution leads to an increase in the energy gap in the ferromagnetic resonance spectrum to 121.5 GHz at T = 4.2 K.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Kolkov, M. I.; Колков, Максим Игоревич; Balaev, A. D.; Балаев, Александр Дмитриевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич
}
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12.

    Engineering of K3YSi2O7 to Tune Photoluminescence with Selected Activators and Site Occupancy / J. Qiao [et al.] // Chem. Mater. - 2019. - Vol. 31, Is. 18. - P. 7770-7778, DOI 10.1021/acs.chemmater.9b02990. - Cited References: 48. - This work was supported by the National Natural Science Foundation of China (Nos. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036), Fundamental Research Funds for the Central Universities (FRF-TP-18-002C1), and Guangdong Provincial Science & Technology Project (2018A050506004). This work was also supported by the National Science Foundation, Ceramics Program (No. 1911372), and the computational resources were provided by the Extreme Science and Engineering Discovery Environment (XSEDE) supported by the National Science Foundation (No. ACI-1548562). . - ISSN 0897-4756
   Перевод заглавия: Производство K3YSi2O7 для настройки фотолюминесценции с выбранными активаторами и заселением позиций
Кл.слова (ненормированные):
Citrus fruits -- Density functional theory -- Doping (additives) -- Energy gap -- Gallium alloys -- III-V semiconductors -- Indium alloys -- Light -- Light emitting diodes -- Metal ions -- Phosphors -- Photoluminescence -- Rare earths -- Rietveld refinement -- Semiconductor alloys
Аннотация: The luminescence of rare earth ions (Eu2+, Ce3+, and Eu3+)-doped inorganic solids is attractive for the screening of phosphors applied in solid-state lighting and displays and significant to probe the occupied crystallographic sites in the lattice also offering new routes to photoluminescence tuning. Here, we report on the discovery of the Eu- and Ce-activated K3YSi2O7 phosphors. K3YSi2O7:Eu is effectively excited by 450 nm InGaN blue light-emitting diodes (LEDs) and displays an orange-red emission originated from characteristic transitions of both Eu2+ and Eu3+, while K3YSi2O7:Ce3+ shows green emission upon 394 nm near-ultraviolet (NUV) light excitation. Rietveld refinement verifies the successful doping of the activators, and density functional theory (DFT) calculations further support that Eu2+ occupies both K1 and Y2 crystallographic sites, while Ce3+ and Eu3+ only occupy the Y2 site; hence, the broad-band red emission of Eu2+ are attributed to a small DFT band gap (3.69 eV) of K3YSi2O7 host and a selective occupancy of Eu2+ in a highly distorted K1 site and a high crystal field splitting around Y2 sites. The white LEDs device utilizing orange-red-emitting K3YSi2O7:Eu and green-emitting K3YSi2O7:Ce3+ exhibits an excellent CRI of 90.1 at a correlated color temperature of 4523 K. Our work aims at bridging multivalent Eu2+/Eu3+ and Ce3+ site occupancy in the same host to realize photoluminescence tuning and especially exposes new ways to explore new phosphors with multicolor emission pumped by blue and NUV light for white LEDs.

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Держатели документа:
School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, China
Department of Nanoengineering, University of California, San Diego, 9500 Gilman Drive, San Diego, CA 92093, United States
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China

Доп.точки доступа:
Qiao, J.; Amachraa, M.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chuang, Y. -C.; Ong, S. P.; Zhang, Q.; Xia, Z.
}
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13.

Conformational changes in DNA aptamers upon binding to Pb ions / R. V. Moryachkov, A. N. Berlina, P. V. Artyushenko [et al.] // The Fifth Asian School-Conference on Physics and Technology of Nanostructured Materials : Proceedings. - VLadivostok : Dalnauka Publishing, 2020. - Ст. VII.31.01p. - P. 193. - The reported study was funded by RFBR, project number 19-32-90266. . - ISBN 978-5-8044-1698-1

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Доп.точки доступа:
Moryachkov, R. V.; Морячков, Роман Владимирович; Berlina, A. N.; Artyushenko, P. V.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Peters, G. S.; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Asian School-Conference on Physics and Technology of Nanostructured Materials(5 ; 2020 ; 30 Jul - 3 Aug ; Vladivostok); Азиатская школа-конференция по физике и технологии наноструктурированных материалов(5 ; 2013 ; 30 июля - 3 авг. ; Владивосток)
}
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14.

    Magnetodielectric effect and spin state of iron ions in iron-substituted bismuth pyrostannate / L. Udod, S. Aplesnin, M. Sitnikov [et al.] // Eur. Phys. J. Plus. - 2020. - Vol. 135, Is. 10. - Ст. 776, DOI 10.1140/epjp/s13360-020-00781-2. - Cited References: 38. - This study was supported in part by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, Project No. 18-42-240001 r_a «Inversion of the Sign of the Magnetoelectric Tensor Components on Temperature in Neodymium-Substituted Bismuth Ferrite Garnet Films » and by the Russian Foundation for Basic Research, Project No. 20-52-00005 bel_a . - ISSN 2190-5444
   Перевод заглавия: Магнитодиэлектрический эффект и спиновое состояние ионов железа в железо-замещенном висмутовом пиростаните
Аннотация: The magnetic and magnetodielectric properties of bismuth pyrostannate Bi2(Sn1-xFex)2O7 (x= 0.1 and 0.2) have been examined. Using the Mossbauer spectroscopy and electron paramagnetic resonance, the high-spin state and crystallographic positions of iron ions have been established. The coexistence of triclinic symmetry domains in the Bi2(Sn1-xFex)2O7(x=0.1) compound with the monoclinic symmetry below 140 K has been found. For the Bi2(Sn1-xFex)2O7 composition with x= 0.2 , the nonlinear field dependence of magnetization in the paramagnetic region up to room temperatures has been observed. The electric polarization hysteresis and the magnetoelectric effect in the Bi2(Sn1-xFex)2O7 compound have been disclosed. The magnetic field-dependent anomalous behavior of magnetization has been explained by the magnetoelectric effect.

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Держатели документа:
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Akademgorodok 50, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Udod, L. V.; Удод, Любовь Викторовна; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Sitnikov, M.; Romanova, O. B.; Романова, Оксана Борисовна; Bayukov, O. A.; Баюков, Олег Артемьевич; Vorotinov, A. M.; Воротынов, Александр Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Patrin, G. S.; Патрин, Геннадий Семёнович
}
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15.

Orlov, Yu. S.
Erratum to: Magnetic properties and spin crossover in transition metal oxides with d5 ions at high pressures / Y. S. Orlov, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2020. - Vol. 131, Is. 2. - P. 374-374, DOI 10.1134/S1063776120320011. - Cited References: 1 . - ISSN 1063-7761. - ISSN 1090-6509

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К публикации Orlov Yu. S. Magnetic properties and spin crossover in transition metal oxides with d5 Ions at high pressures [Текст] / Y. S. Orlov, S. V. Nikolaev, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2019. - Vol. 129 Is. 6.- P.1062-1069

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Nikolaev, S. V.; Николаев, Сергей Викторович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Орлов, Юрий Сергеевич
}
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16.

Malakhovskii, A. V.
Magnetic circular dichroism of 5I8→ 5F3, 5F2 and 3K8 transitions in Na0.4Ho0.6F2.2 single crystal / A. V. Malakhovskii, V. V. Sokolov, D. N. Karimov // Opt. Mater. - 2021. - Vol. 114. - Ст. 110953, DOI 10.1016/j.optmat.2021.110953. - Cited References: 23. - A.V. Malakhovskii and V.V. Sokolov acknowledge the financing of the reported study by the Russian Foundation for Basic Researches grant 19-02-00034 and by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local environment on magneto-optical properties of f-f transitions in rare-earth aluminum and iron borates.” D.N. Karimov acknowledges the financing support by the Ministry of Science and Higher Education of Russia within the State assignment FSRC «Crystallography and Photonics» of Russian Academy of Sciences . - ISSN 0925-3467
Кл.слова (ненормированные):
Magnetic circular dichroism -- f-f transitions -- Fluoride crystals Ho3+ ions
Аннотация: We measured optical absorption and magnetic circular dichroism spectra of Na0.4Ho0.6F2.2 single crystal in the region of 5I8→ 5F3, 5F2 and 3K8 transitions in Ho3+ ion at 90 K and room temperature. Paramagnetic magneto-optical activities (MOA) of the transitions were found for these two temperatures and compared with the theory based on the nature of f-f transitions allowance. It was shown that nature of allowance of three considered transitions is different. The MCD spectra were also analyzed in approximation of the |J, ±MJ› wave functions of the free atom and using concept of the crystal quantum number. Using this concept and experimental paramagnetic MOA, we found that MJeff = 2.1 for the initial state of the 5I8→ 5F3 transition.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Federal Scientific Research Centre «Crystallography and Photonics» of Russian Academy of Sciences, Leninskiy Prospekt 59, Moscow, 119333, Russian Federation

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Karimov, D. N.; Малаховский, Александр Валентинович
}
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17.

Comparison of the absorption spectra of Nd3+ ions in the NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and Ho0.75Nd0.25Fe3(BO3)4 crystals / A. L. Sukhachev, A. V. Malakhovskii, C. S. Nelson [et al.] // Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P. 113-121, DOI 10.1134/S1063783421010200. - Cited References: 21. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project: number 19-42-240003 “Influence of the local en-vironment on magneto-optical properties of f–f transitions in rare-earth aluminum and iron borates” . - ISSN 1063-7834
Кл.слова (ненормированные):
neodymium -- hantite-structure ferroborates -- f–f electronic transitions -- structural transition
Аннотация: The polarized optical absorption spectra in the region of a series of the f–f transitions of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4, and NdFe3(BO3)4 crystals at 90 K have been compared. The spectral features related to the difference in the local environment of Nd3+ ions in these crystals have been established. In the region of the transition 4I9/2 → 4G5/2 + 2G7/2 of Nd3+ ions in the Ho0.75Nd0.25Fe3(BO3)4 crystal, the appearance of some absorption lines at the structural transition R32 → P3121 around ~200 K due to the local symmetry variation has been found. The intensity of these lines smoothly increases with a decrease in temperature from the transition point. The temperature dependence of the lattice parameters of the Ho0.75Nd0.25Fe3(BO3)4 crystal has been measured. It has been found that, at the transition temperature, the lattice parameter a changes stepwise, which is indicative of the occurrence of a first-order phase transition. The lattice parameter c changes smoothly.

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Публикация на русском языке Сравнение спектров поглощения ионов Nd3+ в кристаллах NdFe3(BO3)4, Nd0.5Gd0.5Fe3(BO3)4 и Ho0.75Nd0.25Fe3(BO3)4 [Текст] / А. Л. Сухачев, А. В. Малаховский, C. S. Nelson [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 1. - С. 111-119

Держатели документа:
Kirensky Institute of Physics, FRC KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, United States

Доп.точки доступа:
Sukhachev, A. L.; Сухачев, Александр Леонидович; Malakhovskii, A. V.; Малаховский, Александр Валентинович; Nelson, C. S.; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович
}
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18.

Magnetic states of Fe2+ ions in FexMn1–xS induced by chemical pressure / G. M. Abramova, Y. V. Knyazev, O. A. Bayukov, S. P. Kubrin // Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P. 68-74, DOI 10.1134/S1063783421010029. - Cited References: 25. - The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (state contract in the sphere of scientific activities, Southern Federal University, 2020) . - ISSN 1063-7834
Кл.слова (ненормированные):
monosulfides of 3d elements -- strongly correlated compounds -- Mossbauer studies -- Fe2+ ion state
Аннотация: Influence of the chemical pressure (x) in single crystals of FexMn1 – xS (0.12 ≤ x ≤ 0.29) on the spin state of iron ions was studied by Mössbauer spectroscopy in the temperature range from 4.2 to 300 K. Peculiarities of formation of the paramagnetic and antiferromagnetic phases of solid solutions were found. Substitution of Fe2+ cations in the high-spin state for Mn2+ was found to occur in FexMn1 – xS as x changes. A decrease in the distance between the ions in FexMn1 – xS induces changes in the state of the Fe2+ ions in the samples with x = 0.25 and 0.29. The asymmetry parameter of the electric field gradient (EFG) tensor and the angle between the directions of the magnetic moment and the principal axis of the electric field gradient were found to change in the magnetically ordered phase at 4.2 K; the angle between the magnetic moment and the electric field gradient axis changes from 21° in the sample with x = 0.12 to 33° when x = 0.29.

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Публикация на русском языке Магнитные состояния ионов Fe2+ в FexMn1-xS, индуцированные химическим давлением [Текст] / Г. М. Абрамова, Ю. В. Князев, О. А. Баюков, С. П. Кубрин // Физ. тверд. тела. - 2021. - Т. 63 Вып. 1.- Ст.69-75

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Research Institute of Physics, Southern Federal University, Rostov-on-Don, 344090, Russian Federation

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Kubrin, S. P.
}
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19.

    Formation, evolution and characteristics of copper sulfide nanoparticles in the reactions of aqueous cupric and sulfide ions / Y. Mikhlin, V. Nasluzov, A. Ivaneeva [et al.] // Mater. Chem. Phys. - 2020. - Vol. 255. - Ст. 123600, DOI 10.1016/j.matchemphys.2020.123600. - Cited References: 74. - This research was supported by the Russian Foundation for Basic Research , project 18-03-00526a . We thank the ESRF for allocating beamtime, and the BM23 staff for their help during the experiments. Facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work . - ISSN 0254-0584
   Перевод заглавия: Формирование, эволюция и свойства наночастиц сульфида меди, сформировавшихся в результате реакции между ионами меди и серы в водном растворе
Кл.слова (ненормированные):
Copper sulfide nanoparticles -- Polysulfide -- X-ray photoelectron spectroscopy -- X-ray absorption spectroscopy -- DFT+U
Аннотация: Colloidal copper sulfides produced in reactions of aqueous copper and sulfide ions are important for many materials applications, environment and mineral processing. Here, CuxS nanoparticles formed and aged at varying copper sulfate to sodium sulfide ratios were studied using in situ UV–vis–NIR spectroscopy, dynamic light scattering, X-ray absorption spectroscopy, ex situ TEM, X-ray photoelectron spectroscopy and Raman scattering, and DFT + U calculations. It was established that the ratio of aqueous Cu2+ to S2− ions of 1:2 is critical for the reaction, which yields disordered covellite-like 4–6 nm Cu0.7S nanoparticles comprised polysulfide species at this and higher sulfide concentrations; upon aging, the particles release sulfur and transform to chalcocite-like structure (Cu2-xS, x < 1). Conversely, at the “excess” of copper ions, Cu2-xS-type particles grew into 12–14 nm “covellitic” nanoparticles. The optical absorbance at 1100–1200 nm commonly attributed to localized surface plasmon resonance increased with time and was lowest for Cu2+/S2−= 1:2. DFT + U calculations found that polysulfide stabilizes copper-deficit covellite, while Cu vacancies in chalcocite are more favorable and destabilized by S–S bonding; the Fermi level energy increases and the hole density decreases with polysulfide formation. We believe that CuS2 clusters form initially, and following conversion of disulfide to polysulfide and then monosulfide ions rather than release of Cu determines the character of CuxS nanoparticles.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50/24, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny Pr. 79, Krasnoyarsk, 660041, Russian Federation
European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, Grenoble, F-38042, France

Доп.точки доступа:
Mikhlin, Y. L.; Nasluzov, V.; Ivaneeva, A.; Vorobyev, S.; Likhatski, M.; Romanchenko, A.; Krylov, A. S.; Крылов, Александр Сергеевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Meira, D. M.
}
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20.

    Data-driven photoluminescence tuning in Eu2+-doped phosphors / S. Lai, M. Zhao, J. Qiao [et al.] // J. Phys. Chem. Lett. - 2020. - Vol. 11, Is. 14. - P. 5680-5685, DOI 10.1021/acs.jpclett.0c01471. - Cited References: 34. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51972118, 51961145101 and 51722202), Fundamental Research Funds for the Central Universities (D2190980), Guangzhou Science & Technology Project (202007020005), Guangdong Provincial Science & Technology Project (No. 2018A050506004), and the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01X137). This work is also funded by RFBR according to the research project No. 19-52-80003 . - ISSN 1948-7185
   Перевод заглавия: Настройка фотолюминесценции люминофоров, легированных Eu2+, за счет анализа базы данных
Рубрики:
Phosphors
   Luminescence properties
   Crystal structure
   Ions
   Quantum mechanics
Аннотация: Discovery of rare earth phosphors has generally relied on the chemical intuition and time-intensive trial-and-error synthesis; therefore, finding new materials assisted by data-driven computations is urgent. Herein, we utilize a regression model to predict the emission wavelengths of Eu2+-doped phosphors by revealing the relationships between the crystal structure and luminescence property. The emission wavelengths of [Rb(1–x)K(x)]3LuSi2O7:Eu2+ (0 ≤ x ≤ 1) phosphors, as examples for the data-driven photoluminescence tuning, are successfully predicted on the basis of the existing data of only eight systems, also consistent with the experimental results. These phosphors can be excited by blue light and exhibit broad-band red and near-infrared emission ranging from 619 to 737 nm. These findings in Eu2+-doped silicate phosphors indicate that data-driven computations through the regression mode would have bright application in discovering novel phosphors with a target emission wavelengths.

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State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology BeijingBeijing 100083, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Russian Federation

Доп.точки доступа:
Lai, S.; Zhao, M.; Qiao, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.
}
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