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Гистерезис магнитосопротивления гранулярных ВТСП. Механизм и универсальность полевой ширины гистерезиса / Балаев Д.А.Дубровский А.А. [и др.] // Третья международная конференция "Фундаментальные проблемы высокотемпературной сверхпроводимости" ФПС'08 = The 3rd International Conference "Fundamental Problems of High Temperature Superconductivity" FPS'08 : 13-17 окт., Звенигород, 2008 : сборник трудов. - С. 104-105

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Балаев, Дмитрий Александрович; Balaev; Дубровский, Андрей Александрович; Dubrovskii, A. A.; Шайхутдинов, Кирилл Александрович; Shaikhutdinov; Попков, Сергей Иванович; Popkov, S. I.; Гохфельд, Денис Михайлович; Gokhfeld, D. M.; Гохфельд, Юлия Сергеевна; Gokhfeld, Yu. S.; Петров, Михаил Иванович; Petrov; "Фундаментальные проблемы высокотемпературной сверхпроводимости", международная конференция(3 ; 2008 ; окт. ; Звенигород); Физический институт им. П.Н. Лебедева РАН
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Локальные искажения электронной плотности как центры пиннинга в Y1−xRExBa2Cu3O7−δ / М. И. Петров, Ю. С. Гохфельд, Д. А. Балаев [и др.] // Третья Междунар. конф. "Фундам. пробл. высокотемпер. сверхпроводимости" ФПС'08 : 13-17 окт., Звенигород, 2008 : сборник трудов. - С. 156-157

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Петров, Михаил Иванович; Petrov, M. I.; Гохфельд, Ю.С.; Балаев, Дмитрий Александрович; Balaev, D. A.; Попков, Сергей Иванович; Popkov, S. I.; Дубровский, Андрей Александрович; Dubrovskiy, A. A.; Гохфельд, Денис Михайлович; Gokhfeld, D. M.; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; "Фундаментальные проблемы высокотемпературной сверхпроводимости", международная конференция(3 ; 2008 ; окт. ; Звенигород)
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Pinning enhancement by heterovalent substitution in Y1−xRExBa2Cu3O7−δ / Petrov M.I., Gokhfeld Yu.S., Balaev D.A., Popkov S.I., Dubrovskiy A.A., Gokhfeld D.M., Shaykhutdinov K.A. // 25th International Conference on Low Temperature Physics (LT25). – Amsterdam, Netherlands. - August 6-13. – 2008. – PB-Tu130, p.304

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Gokhfeld, Yu. S.; Гохфельд, Ю. С.; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович
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Особенности временной эволюции магнитосопротивления гранулярных ВТСП в постоянном магнитном поле [Text] / Балаев Д.А.Дубровский А.А. [и др.] // Третья международная конференция "Фундаментальные проблемы высокотемпературной сверхпроводимости" ФПС'08 = The 3rd International Conference "Fundamental Problems of High Temperature Superconductivity" FPS'08 : 13-17 окт., Звенигород, 2008 : сборник трудов. - С. 117-118

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Балаев, Дмитрий Александрович; Balaev, D. A.; Дубровский, Андрей Александрович; Dubrovskiy, A. A.; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; Попков, Сергей Иванович; Popkov, S. I.; Петров, Михаил Иванович; Petrov; "Фундаментальные проблемы высокотемпературной сверхпроводимости", международная конференция(3 ; 2008 ; окт. ; Звенигород); Физический институт им. П.Н. Лебедева РАН
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Unraveling dynamic Jahn-Teller effect and magnetism in FeTiF6×6H2O single crystal / M. S. Platunov, N. A. Fedorova, Yu. V. Pyastolova [et al.] // J. Alloys Compd. - 2024. - Vol. 999. - Ст. 175104, DOI 10.1016/j.jallcom.2024.175104. - Cited References: 51. - The authors thank the Joint Supercomputer Center (JSCC) of the Russian Academy of Sciences. The authors would like to express their sincere gratitude to the ID12 beamline staff their exceptional dedication and professionalism in performing the synchrotron experiment during the challenging circumstances of the COVID-pandemic. We are particularly grateful to the postdocs, scientists, and technicians who took part in the experiment, ensuring its successful completion. We also gratefully acknowledge the provision of beamtime (Proposal HC-4375) by the European Synchrotron Radiation Facility (ESRF). The access to this world-class facility was instrumental in obtaining the high-quality data that formed the basis of our research. We are deeply appreciative of the contributions of all involved, and we extend our heartfelt thanks to each and every one of them . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Dynamic Jahn-Teller effect -- Density functional theory -- B3LYP -- Magnetic and electronic properties -- Mossbauer spectroscopy -- XMCD -- XANES
Аннотация: Hydrated iron fluoridotitanate (FeTiF6 × 6 H2O) single crystals are fascinating magnetic materials with unique properties. To understand the underlying mechanisms, this study combines X-ray absorption near-edge structure (XANES) and X-ray magnetic circular dichroism (XMCD) techniques, complemented by density functional theory (DFT) calculations. Polarization-dependent X-ray absorption spectroscopy, encompassing XANES and XMCD, is a powerful technique for probing the local structures and magnetic properties of materials. It is element-selective, bulk-sensitive, and compatible with a wide range of experimental conditions. In this study, we used XANES and XMCD spectroscopies to investigate the local structures and magnetic properties of Fe and Ti in FeTiF6 × 6 H2O single crystals. XANES analysis revealed distinct local environments around Fe and Ti, providing insights into their coordination environments. Element-selective magnetization measurement at the Fe K-edge demonstrated that iron sites in the oxidation state Fe2+ have an unambiguous paramagnetic contribution to the magnetization along the b-axis. Notably, the absence of an XMCD signal at the Ti K-edge confirmed the absence of a magnetic moment in Ti atoms within the crystal. DFT calculations corroborate the experimental findings and provide insights into the electronic structure and magnetic interactions. The combined results provide a comprehensive understanding of the dynamic Jahn-Teller effect in FeTiF6 × 6 H2O single crystals, highlighting the significance of polarization-dependent X-ray absorption spectroscopy in unraveling the intricate magnetic behavior of such materials. This study contributes to the fundamental understanding of magnetism in these materials and paves the way for the development of novel magnetic materials with tailored properties.

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Держатели документа:
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol’tsovo 630559 , Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok 690022, Russia

Доп.точки доступа:
Platunov, M. S.; Платунов, Михаил Сергеевич; Fedorova, N. A.; Федорова, Наталья А.; Pyastolova, Yu. V.; Пястолова, Юлия Валентиновна; Laptash, N. M.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Tomilin, F. N.; Томилин, Феликс Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
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Synthesis, structure and magnetic properties of monoclinic lanthanum-chromium borate LaCr3(BO3)4 / E. A. Volkova, M. S. Platunov, A. M. Antipin [et al.] // J. Alloys Compd. - 2024. - Vol. 994. - Ст. 174683, DOI 10.1016/j.jallcom.2024.174683. - Cited References: 38. - Single crystal X-ray analysis was carried out within the State assignment NRC "Kurchatov institute" (research contribution of A.M.A.). The research contribution of M.S.P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility "SKIF", Boreskov Institute of Catalysis (project FWUR-2024–0040) . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
Borates -- Flux growth -- Crystal structure -- Differential scanning calorimetry -- Powder X-ray diffraction -- IR spectroscopy -- Antiferromagnet
Аннотация: Single crystals of LaCr3(BO3)4 were synthesized through spontaneous nucleation from a K2Mo3O10 flux melt. The crystal structure was determined using single-crystal X-ray diffraction (XRD) at temperatures of 293 K and 85 K. LaCr-borate crystallizes in the monoclinic C2/c space group with unit cell parameters a = 7.47980(5) Å, b = 9.55180(7) Å, c = 11.48330(8) Å, β= 104.0060(6)°, V = 796.04(1) Å3 (for C1, T = 293 K), and a = 7.47380(5) Å, b = 9.55520(7) Å, c = 11.47100(8) Å, β = 103.9330(6)°, V = 795.08(1) Å3 (for C2, T = 85 K), each with Z = 4. The temperature dependence of the unit cell parameters, including the monoclinic angle (β) and the unit cell volume (V), was investigated over the range of 85–293 K. No structural phase transitions were observed in the low-temperature region down to 85 K. Differential scanning calorimetry (DSC) measurements revealed no high-temperature phase transitions between 50 and 1350°C. Infrared (IR) spectroscopy confirmed the monoclinic structure of LaCr3(BO3)4 crystals, revealing characteristic absorption bands, including the lowest frequency mode associated with the translational vibrations of the La3+ ion.

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Держатели документа:
Faculty of Geology, Lomonosov Moscow State University, Moscow, Russian Federation
Synchrotron radiation facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol’tsovo, Russian Federation
Shubnikov Institute of Crystallography, Complex "Crystallography and Photonics", NRC "Kurchatov institute", Moscow, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences, Moscow, Russian Federation

Доп.точки доступа:
Volkova, E. A.; Platunov, M. S.; Платунов, Михаил Сергеевич; Antipin, A. M.; Alpanova, R. R.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Pyastolova, Yu. V.; Пястолова, Юлия Валентиновна; Podobraznyh, A. D.; Kosorukov, V. L.; Koporulina, E. V.; Maltsev, V. V.
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Microbially mediated synthesis of vivianite by Desulfosporosinus on the way to phosphorus recovery / Yu. V. Knyazev, M. S. Platunov, O. P. Ikkert [et al.] // Environ. Sci.: Adv. - 2024. - Vol. 3, Is. 6. - P. 897-911, DOI 10.1039/D4VA00040D. - Cited References: 120. - This study was supported by the Russian Science Foundation, project no. 22-24-00601 (https://rscf.ru/project/22-24-00601/). The electron microscopy and Mössbauer studies were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The research contribution of M. S. P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility “SKIF”, Boreskov Institute of Catalysis (project FWUR-2024-0040) . - ISSN 2754-7000
Аннотация: We explored the role of biomineralization in industrial waste sludge formation, using the laboratory cultivation of Desulfovibrio sp. OL sulfate reducing species isolated from the Komsomolsky waste sludge (Russia). The most frequently reported sulfate-reducing bacteria (SRB) biomineralization products are various iron sulfides. Here we present first studies of the products of Desulfosporosinus metallidurans, acidophilic SRB from acid mine drainage. We analyzed the biomineralized sample using X-ray diffraction, electron microscopy, X-ray absorption and Mossbauer spectroscopies, and magnetization measurements via First-Order Reversal Curve (FORC) diagram analysis. Our findings show that the biomineralization occurring under pure culture conditions leads to the formation of greigite (Fe3S4) nanorods, along with larger microbially mediated crystals of vivianite (Fe3(PO4)2·8H2O) and siderite (FeCO3). Energy dispersive X-ray spectroscopy revealed that the crystal sizes of vivianite and siderite were comparatively larger than those of the nanorod-shaped greigite. Transmission electron microscopy and Mossbauer spectroscopy detected ultrafine ferrihydrite (Fe2O3·nH2O) superparamagnetic nanoparticles with an average size of 2.5 nm. FORC analysis showed significant magnetic interactions among these nanoparticles, suggesting their potential for magnetic separation applications. The current study demonstrates that ferrihydrite nanoparticles have a strong magnetic affinity for other crystal phases produced by Desulfosporosinus metallidurans. Therefore, we believe that the investigated bacterial species can be exploited in advanced magnetic separation techniques. This offers a cost-effective and environmentally friendly method for purifying sediments in industrial waste sludge.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Department of Plant Physiology, Biotechnology, and Bioinformatics, Tomsk State University, Tomsk, Russia
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol'tsovo, Russia
Budker Institute of Nuclear Physics, Novosibirsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Institute of Solid State Chemistry and Mechanochemistry, Novosibirsk, Russia

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Platunov, M. S.; Ikkert, O. P.; Semenov, S. V.; Семёнов, Сергей Васильевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Nikolenko, A. D.; Nazmov, V. P.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Smorodina, E. D.; Balaev, D. A.; Балаев, Дмитрий Александрович; Karnachuk, O. V.
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Проявление поверхностных и размерных эффектов в магнитных свойствах наночастиц ε-Fe2O3. (Краткий обзор) / Д. А. Балаев, А. А. Дубровский, Ю. В. Князев [и др.] // Физ. твердого тела. - 2023. - Т. 65, Вып. 6. - С. 979-988, DOI 10.21883/FTT.2023.06.55654.12H. - Библиогр.: 66 . - ISSN 0367-3294. - ISSN 1726-7498
Кл.слова (ненормированные):
оксид железа ε-Fe2O3 -- наночастицы -- размерный эффект -- поверхностная манитная анизотропия
Аннотация: Полиморфная модификация оксида железа, известная как ε-Fe2O3, существует только в виде наночастиц с характерными размерами до нескольких десятков нанометров. Частицы указанных размеров демонстрируют большую коэрцитивную силу, около 20 kOe при комнатной температуре. В области температур 80–150 K в ε-Fe2O3 происходит магнитный переход, сопровождающийся резким уменьшением коэрцитивной силы. В то же время, есть значительные различия в магнитном поведении "крупных" (~ 20 nm) частиц и частиц ультрамалых размеров (до 6 nm). Ряд экспериментальных фактов свидетельствует о проявлении размерных эффектов, приводящих к изменению магнитной структуры в частицах указанных размеров. Кроме того, для таких частиц проявляется и поверхностный эффект – существенный вклад в магнитное поведение вносит поверхностная магнитная анизотропия. В настоящей работе проведен краткий обзор проявления указанных размерных и поверхностных эффектов в магнитных свойствах наночастиц ε-Fe2O3.

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Переводная версия The manifestation of surface and size effects in the magnetic properties of ε-Fe2O3 nanoparticles. (Brief overview) [Текст] / D. A. Balaev, A. A. Dubrovskii, Yu. V. Knyazev [et al.]. - 9 с. // Phys. Solid State. - 2023. - Vol. 65 Is. 6.- P.938-946

Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук, Красноярск, Россия
Институт катализа им. Г.К. Борескова СО РАН, Новосибирск, Россия

Доп.точки доступа:
Балаев, Дмитрий Александрович; Balaev, D. A.; Дубровский, Андрей Александрович; Dubrovskii, A. A.; Князев, Юрий Владимирович; Knyazev, Yu. V.; Семенов, Сергей Васильевич; Semenov, S. V.; Кириллов, В. Л.; Мартьянов, О. Н.; "Нанофизика и наноэлектроника", международный симпозиум(27 ; 2023 ; март ; 13-16 ; Нижний Новгород)
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Проявление поверхностных и размерных эффектов в магнитных свойствах наночастиц ε-Fe2O3 / Д. А. Балаев, А. А. Дубровский, А. А. Красиков [и др.] // Нанофизика и наноэлектроника : Труды XXVII Международного симпозиума : в 2-х т. - Нижний Новгород, 2023. - Т. 1. Секция "Магнитные наноструктуры". - С. 147-148. - Библиогр.: 13 . - ISBN 978-5-8048-0120-6

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Держатели документа:
Институт физики им. Л. В. Киренского СО РАН : Институт катализа им. Г. К. Борескова СО РАН

Доп.точки доступа:
Балаев, Дмитрий Александрович; Balaev, D. A.; Дубровский, Андрей Александрович; Dubrovskii, A. A.; Красиков, Александр Александрович; Krasikov, A. A.; Семенов, Сергей Васильевич; Semenov, S. V.; Князев, Юрий Владимирович; Knyazev, Yu. V.; Баюков, Олег Артемьевич; Bayukov, O. A.; Якушкин, С. С.; Кириллов, В. Л.; Мартьянов, Олег Николаевич; "Нанофизика и наноэлектроника", международный симпозиум(27 ; 2023 ; март ; 13-16 ; Нижний Новгород); Министерство науки и высшего образования Российской Федерации; Научный совет РАН по физике конденсированных сред; Научный совет РАН по физике полупроводников; Институт физики микроструктур РАН; Нижегородский государственный университет им. Н.И. Лобачевского
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10.

Raman scattering, absorption and luminescence spectroscopy of CoSiF6·6H2O crystal and CoSiF6·6H2O:Mn4+ red-emitting phosphor / Y. V. Gerasimova, A. S. Aleksandrovsky, N. M. Laptash [et al.] // Opt. Mater. - 2023. - Vol. 144. - Ст. 114343, DOI 10.1016/j.optmat.2023.114343. - Cited References: 30. - The reported study was funded by Russian Science Foundation , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project ‘‘Synthesis, spectral and magnetic properties of ABF6·6H2O systems, new materials for photonics.” No. 23-22-10037 . https://rscf.ru/en/project/23-22-10037/ . Usage of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS is acknowledged. We thank A. Yu. Mamaev for recording the luminesce spectra of CoSiF6·6H2O:Mn 4+ . - ISSN 0925-3467. - ISSN 1873-1252
Кл.слова (ненормированные):
Phase transition -- Dynamics -- Raman -- Electronic excitations -- Luminescence -- Tanabe-Sugano
Аннотация: CoSiF6·6H2O and CoSiF6·6H2O:Mn4+ crystals were investigated by means of Raman, optical absorption, and luminescence spectroscopy. Absorption spectra of CoSiF6·6H2O are analyzed by Tanabe-Sugano technique and are proved to be well-describable at crystal field strength Dq = 1000 cm−1, and Racah parameters B = 896 cm−1, C = 4408 cm−1, Dq/B = 1.116. Raman spectroscopy reveals a phase transition associated with the ordering of both the CoO6 and SiF6 octahedra, which occurs through the ordering of the H2O subsystem. Luminescence spectrum of Mn4+ ions in CoSiF6·6H2O lattice consists of six components corresponding to Stokes and anti-Stokes emission from 2E state of Mn4+ ion at vibrational frequencies of MnF6 octahedron ν6 = 230 cm−1, ν4 = 335 cm−1, and ν3 = 645 cm−1. Quantum efficiency of red emission maximizes at excitation wavelength 357 nm and equals to 5%. Decrease of quantum efficiency in comparison to other related materials is explained by absorption of Co2+ ions and non-radiative relaxation in the Co2+ subsystem.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Laptash, N. M.; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimov, M. A.; Герасимов, Максим Алексеевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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11.

Giant anisotropy of magnetic properties of hydrated iron fluoridotitanate molecular single crystal / A. A. Dubrovskiy, Yu. V. Knyazev, D. A. Velikanov [et al.] // V International Baltic Conference on Magnetism. IBCM : Book of abstracts. - 2023. - P. 57. - Cited References: 4. - РНФ № 23-22-10037 ; Красноярский регион. фонд науки

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Institute of Chemistry, Far Eastern Branch of RAS

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Laptash, N. M.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; International Baltic Conference on Magnetism(5 ; 2023 ; Aug. 20-24 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
}
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12.

Спектральные исследования кристаллов ABF6·6H2O / Ю. В. Герасимова, А. С. Крылов, А. Н. Втюрин [и др.] // Комбинационное рассеяние - 95 лет исследований : тезисы докл. / сопредс. конф. В. Ф. Шабанов, зам. предс. конф., чл. орг. ком. А. Н. Втюрин, чл. орг. ком. А. С. Крылов, чл. орг. ком. С. Н. Крылова. - Новосибирск, 2023. - С. 124DOI 10.34077/SCATTERING95-124. - Библиогр.: 1. - РНФ, Прав-во Красн. края и Красн. краевой фонд науки, проект а № 21-52-12018 ННИО_а

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Держатели документа:
Институт физики им. Л. В. Киренского СО РАН
Сибирский федеральный университет, Красноярск
Институт химии ДВО РАН

Доп.точки доступа:
Шабанов, Василий Филиппович \сопредс. конф.\; Shabanov, V. F.; Втюрин, Александр Николаевич \зам. предс. конф., чл. орг. ком.\; Vtyurin, A. N.; Крылов, Александр Сергеевич \чл. орг. ком.\; Krylov, A. S.; Крылова, Светлана Николаевна \чл. орг. ком.\; Krylova, S. N.; Герасимова, Юлия Валентиновна; Gerasimova, J. V.; Крылов, Александр Сергеевич; Втюрин, Александр Николаевич; Герасимов, М. А.; Лапташ, Наталья Михайловна; Laptash N. M.; Александровский, Александр Сергеевич; Aleksandrovsky, A. S.; Дубровский, Андрей Александрович; Dubrovskii, A. A.; "Комбинационное рассеяние - 95 лет исследований", Российская конференция и школа молодых ученых по актуальным проблемам спектроскопии комбинационного рассеяния света(2023 ; 5-9 июня ; Новосибирск); Школа молодых ученых по актуальным проблемам спектроскопии комбинационного рассеяния света (с участием иностранных ученых)(2023 ; 5-9 июня ; Новосибирск); Институт физики полупроводников им. А.В. Ржанова Сибирского отделения РАН
}
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13.

The manifestation of surface and size effects in the magnetic properties of ε-Fe2O3 nanoparticles. (Brief overview) / D. A. Balaev, A. A. Dubrovskii, Yu. V. Knyazev [et al.] // Phys. Solid State. - 2023. - Vol. 65, Is. 6. - P. 938-946, DOI 10.21883/PSS.2023.06.56105.12H. - Cited References: 66 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
iron oxide ε-Fe2O3 -- nanoparticles -- size effect -- surface magnetic anisotropy
Аннотация: Polymorphic modification of iron oxide, known as ε-Fe2O3, exists only in the form of nanoparticles with characteristic sizes up to several tens of nanometers. Particles of these sizes exhibit a large coercive force, about 20 kOe at room temperature. In the temperature range of 80–150 K, a magnetic transition occurs in ε-Fe2O3, accompanied by a sharp decrease in the coercive force. At the same time, there are significant differences in the magnetic behavior of "large" (~20 nm) particles and ultra-small particles (up to 6 nm). A number of experimental facts indicate the manifestation of size effects that lead to a change in the magnetic structure in particles of these sizes. In addition, a surface effect is also manifested for such particles - a significant contribution to the magnetic behavior is governed by surface magnetic anisotropy. In this paper, a brief review of the manifestation of these size and surface effects in the magnetic properties of ε-Fe2O3 nanoparticles is carried out.

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Публикация на русском языке Проявление поверхностных и размерных эффектов в магнитных свойствах наночастиц ε-Fe2O3. (Краткий обзор) [Текст] / Д. А. Балаев, А. А. Дубровский, Ю. В. Князев [и др.]. - 10 с. // Физ. твердого тела. - 2023. - Т. 65 Вып. 6. - С. 979-988

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Институт катализа им. Г.К. Борескова СО РАН, Новосибирск, Россия

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Semenov, S. V.; Семенов, Сергей Васильевич; Kirillov, V. L.; Martianov, O. N.; Nanophysics and Nanoelectronics, International Symposium(27 ; 13-16 March 2023 ; Nizhny Novgorod, Russia)
}
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14.

Spectroscopy of structurally disordered hydrated iron fluoridotitanate in the regions of vibrational and electronic excitations / Y. V. Gerasimova, A. S. Aleksandrovsky, N. M. Laptash [et al.] // Spectrochim. Acta A. - 2022. - Vol. 264. - Ст. 120244, DOI 10.1016/j.saa.2021.120244. - Cited References: 28. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project “Spectral and magnetic properties of single crystals of transition metal fluoride hexahydrates.” No. 20-42-240014 . - ISSN 1386-1425
Кл.слова (ненормированные):
Hydrated iron fluoridotitanate -- Phase transition -- Order-disorder -- Raman -- Dynamics -- Electronic excitations
Аннотация: Raman and optical absorption spectra of disordered hydrated iron fluoridotitanate (HITF) single crystal were studied. Temperature transformations of the Raman spectra indicate independent ordering processes of the [TiF6]2− and [Fe(H2O)6]2+ complexes below the structural phase transition. The absorption spectrum in the near-infrared and visible ranges includes transitions from the high spin ground state 5T2 of Fe2+ ion to the excited 5E state and a set of excited triplets. Analysis by Tanabe-Sugano method gives crystal field Dq = 490 cm−1 and Racah parameters B = 340 cm−1 and C = 1904 cm−1. Considerable decrease of B parameter as compared to the free ion value indicates a decrease of interelectron repulsion in the disordered neighborhood of Fe2+ ions.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660079, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Laptash, N. M.; Gerasimov, M. A.; Герасимов, М. А.; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович
}
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15.

Superparamagnetic blocking and magnetic interactions in nanoferrihydrite adsorbed on biomineralized nanorod-shaped F3S4 crystallites / Y. V. Knyazev, O. P. Ikkert, S. V. Semenov [et al.] // J. Alloys Compd. - 2022. - Vol. 923. - Ст. 166346, DOI 10.1016/j.jallcom.2022.166346. - Cited References: 109. - This study was supported by the Russian Science Foundation, project no. 22-24-00601 (https://rscf.ru/project/22–24–00601/). - The electron microscopy and Mössbauer spectroscopy studies were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. We thank Dr. Ivan Nemtsev for the SEM images. The contribution of M. P. (development of methodology of sample preparation for EXAFS measurements) was partially supported by the Russian Ministry of Science and Higher Education via the budget project of SRF SKIF, Boreskov Institute of Catalysis . - ISSN 0925-8388
Кл.слова (ненормированные):
Biomineralization -- Superparamagnetic nanoparticles -- Interparticle interactions -- Iron sulfide -- Ferrihydrite
Аннотация: A composite based on nanorod-shaped greigite (Fe3S4) crystallites with adsorbed ferrihydrite (Fe2O3 ‧ nH2O) nanoparticles has been synthesized. The synthesis has been performed by biomineralization of the bacterial wall of a sulfate-reducing Desulfovibrio sp. A2 bacteria. The phase composition of the synthesized composite has been investigated by X-ray powder and electron diffraction, as well as Fourier-transform infrared, extended X-ray absorption fine structure, and Mössbauer spectroscopy. The magnetic measurement data have shown that the sample under study contains two magnetic phases: multidomain nanorod-shaped greigite and ultrasmall ferrihydrite nanoparticles. The constant atomic fraction of the greigite crystalline phase in the range of 4–300 K (~20%) revealed by Mössbauer spectroscopy is indicative of a blocked magnetic moment of nanorod-shaped Fe3S4. It is shown that nanorod-shaped Fe3S4 crystallites are strongly magnetically bound with adsorbed Fe2O3 ‧ nH2O (Eint ~ 1200kB) nanoparticles. This significantly slows down the superparamagnetic relaxation of the magnetic moments of ferrihydrite nanoparticles. Therefore, the blocking temperature noticeably increases and attains, according to the Mössbauer spectroscopy data, a value of TB = 140 K (the magnetic measurements yield TB = 72 K). The processes of superparamagnetic blocking of the magnetic moments of ferrihydrite nanoparticles manifest themselves in the evolution of the magnetic properties of the investigated sample (a significant increase in the coercivity and remanent magnetization). In support of the Mössbauer spectroscopy data, a sufficiently high superparamagnetic blocking temperature has been established, which discloses the effect of magnetizing of ferrihydrite nanoparticles by coarser greigite formations, analogously to the effect of interparticle magnetic interactions.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Plant Physiology, Biotechnology, and Bioinformatics, Tomsk State University, Tomsk, 634050, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Synchrotron radiation facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol'tsovo, 630559, Russian Federation
National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Ikkert, O. P.; Semenov, S. V.; Семёнов, Сергей Васильевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Khramov, E. V.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shestakov, N. P.; Шестаков, Николай Петрович; Smorodina, E. D.; Karnachuk, O. V.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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16.

Iron oxide nanoparticles synthesized by a glycine-modified coprecipitation method: Structure and magnetic properties / A. Omelyanchik, A. S. Kamzin, A. A. Valiullin [et al.] // Colloids Surf. A Physicochem. Eng. Asp. - 2022. - Vol. 647. - Ст. 129090, DOI 10.1016/j.colsurfa.2022.129090. - Cited References: 80. - This work was supported by the Russian Science Foundation grant No. 21-72-20158 . The study of the structure was carried out on the equipment of the Center Collective Use " Materials Science and Metallurgy " which was purchased with the financial support of the Russian Federation represented by the Ministry of Education and Science (No. 075-15-2021-696) . - ISSN 0927-7757
Кл.слова (ненормированные):
Magnetic nanoparticles -- Iron oxide -- Magnetite -- Maghemite -- Glycine -- Mossbauer spectroscopy -- Coprecipitation
Аннотация: Iron oxide magnetic nanoparticles (MNPs) are of interest in biomedicine and research owing to their moderate cytotoxicity and advanced properties, such as extensive surface-to-volume ratio and possibilities for tailoring their functionality through surface chemistry. To date, various approaches have been used for the synthesis of MNPs with controllable structural properties and various coatings to enhance their stability and functionality. This study describes a modified one-step method of coprecipitation in the presence of glycine allowing the production of particles with controllable size and in situ surface decoration. The effect of different glycine concentrations on the morphostructural and magnetic properties of iron oxide MNPs is studied. The particle size is reduced from 10.2 ± 0.3 to 7.2 ± 0.5 nm by increasing the glycine concentration from 0.06 up to 0.60 mol. The magnetic properties of obtained particles were tracked by SQUID magnetometry and Mossbauer spectroscopy. All samples of glycine capped iron oxide MNPs showed superparamagnetic behaviour at room temperature with maximal value of the saturation magnetization of 69 ± 4 Am2/kg. The results show the optimal concentration range of glycine which can be used in this method: a lower concertation than 0.15 mol does not affect the properties of obtained particles while higher concentrations than 0.3 mol lead to the reduction of magnetic properties (the saturation magnetisation reduces to 59 ± 3 Am2/kg when glycine concentration was 0.6 mol). The proposed economic and environment-friendly approach can be utilized to synthesise –NH2 functionalised MNPs for biomedical or wastewater treatment.

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Держатели документа:
Immanuel Kant Baltic Federal University, Kaliningrad, Russian Federation
Department of Chemistry and Industrial Chemistry (DCIC), University of Genova, Genova, Italy
Ioffe Institute of Russian Academy of Science (RAS), St. Petersburg, Russian Federation
Kazan Federal University, Kazan, Russian Federation
St. Petersburg State University, St. Petersburg, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center Siberian branch RAS, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
The National University of Science and Technology MISIS, Moscow, Russian Federation
Institute of Structure of Matter–CNR, Monterotondo Stazione, Rome, 00016, Italy

Доп.точки доступа:
Omelyanchik, A.; Kamzin, A. S.; Valiullin, A. A.; Semenov, V. G.; Vereshchagin, S. N.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Sviridova, T.; Kozenkov, I.; Dolan, E.; Peddis, D.; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Rodionova, V.
}
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17.

    Giant anisotropy of magnetic properties of hydrated iron fluoridotitanate single crystal / A. A. Dubrovskiy, Y. V. Knyazev, D. A. Velikanov [et al.] // J. Alloys Compd. - 2022. - Vol. 898. - Ст. 162748, DOI 10.1016/j.jallcom.2021.162748. - Cited References: 53. - The reported study was funded by Russian Foundation for Basic Research , Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science according to the research project "Spectral and magnetic properties of single crystals of transition metal fluoride hexahydrates.” No. 20-42-240014 . - ISSN 0925-8388
   Перевод заглавия: Гигантская анизотропия магнитных свойств гидратированных ионов монокристалла флюоридотитаната
Аннотация: Study of the magnetic properties of the FeTiF6 ‧ 6 H2O single crystal has shown that this compound is a two-dimensional antiferromagnet with a Néеl temperature of TN = 8 K and its magnetic moment anisotropy attains 7000% at a temperature of T = 4.2 K. The Mössbauer spectroscopy data unambiguously indicate the paramagnetic state of iron cations in the temperature range of 4.2–300 K. However, a sharp change in the difference between the quadrupole doublet linewidths at 10 K has been observed, which is consistent with the temperature of magnetic ordering. It has been suggested that the long-range magnetic order is established in the crystal through the formation of the exchange coupling revealed by the electron spin resonance measurements on the oriented single crystals.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660079, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Laptash, N. M.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна
}
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18.

Dynamic processes of the water sublattice in FeTiF6·xH2O·yD2O crystal / Yu. V. Gerasimova, A. S. Krylov, A. N. Vtyurin [et al.] // J. Raman Spectrosc. - 2022. - Vol. 53, Is. 10 : Special Issue: Vibrational Spectroscopy of Water. - P. 1704-1709, DOI 10.1002/jrs.6430. - Cited References: 31. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Regional Foundation of Science according to the research project “Spectral and magnetic properties of single crystals of transition metal fluoride hexahydrates” No. 20-42-240014 . - ISSN 0377-0486
Кл.слова (ненормированные):
deuterium ordering -- dynamics -- hydrated iron fluoridotitanate -- hydrogen bonds -- phase transition -- spectra -- water sublattice
Аннотация: Phase transition in FeTiF6·xH2O·yD2O crystals has been studied by Raman spectroscopy. The 611 cm-1 line corresponding to mode A1g of [TiF6]2- system does not exhibit anomalous behavior associated with the phase transition. The temperature studies showed that below the phase transition temperature, the equivalence of D2O molecules in FeTiF6·xH2O·yD2O octahedron is broken. The phase transition mechanism in the compound under study is associated with Fe(xH2O·yD2O) complex.

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Держатели документа:
Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Chemistry, Far Eastern Branch of RAS, Vladivostok, Russian Federation

Доп.точки доступа:
Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Laptash, N. M.; Pogoreltsev, E. I.; Погорельцев, Евгений Ильич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Gerasimov, M. A.; Герасимов, М. А.
}
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19.

Influence of the Jahn-Teller effect on magnetic anisotropy in single crystals of fluorine hexahydrates of transition metals / A. A. Dubrovskiy, Y. V. Knyazev, Yu V. Gerasimova [et al.] // Phys. Solid State. - 2022. - Vol. 64, Is. 11. - P. 1709-1712, DOI 10.21883/PSS.2022.11.54194.406. - Cited References: 16. - The work was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Krai and the Krasnoyarsk Krai Foundation of Science within the research project No. 20-42-240014 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
single crystal -- magnetic anisotropy -- Jahn-Teller effect
Аннотация: The magnetic properties of fluorine hexahydrates of transition metals have been studied. It was found that the presence of spin-orbit interaction of the transition metal ion has a significant effect on anisotropy of magnetic properties. Depending on the direction of interaction of the orbital magnetic moment of a transition metal cation with a crystal field easy direction of magnetization changes from the crystallographic b-axis to the c-axis.

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Публикация на русском языке Влияние эффекта Яна-Теллера на магнитную анизотропию в монокристаллах фтористых гексагидратов переходных металлов [Текст] / А. А. Дубровский, Ю. В. Князев, Ю. В. Герасимова [и др.] // Физ. тверд. тела. - 2022. - Т. 64 Вып. 11.- Ст.1736-1740

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia

Доп.точки доступа:
Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Udovenko, A. A.; Laptash, N. M.
}
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20.

Synthesis of Co-Ni alloy particles with the structure of a solid substitution solution by precipitation in a supercritical carbon dioxide / N. Nesterov, V. Pakharukova, S. Cherepanova [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 24. - Ст. 4366, DOI 10.3390/nano12244366. - Cited References: 52. - This research was funded by the Russian Science Foundation, grant number № 21-73-00213 (https://rscf.ru/project/21-73-00213/ (accessed on 2 September 2020)). - The authors are grateful to S.V. Komogortsev and S.V. Stolyar for fruitful discussions and A.A. Krasikov for help in measurements. The magnetic measurements were performed using equipment from the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences . - ISSN 2079-4991
Кл.слова (ненормированные):
supercritical fluids -- Co-Ni alloy -- solid substitution solution
Аннотация: Mixed Co-Ni bimetallic systems with the structure of a solid substitution solution have been synthesized using the supercritical antisolvent precipitation (SAS) method, which uses supercritical CO2 as an antisolvent. The systems obtained have been characterized in detail using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Fourier-transform infrared (FTIR) spectroscopy, and magnetostatic measurements. It has been found that Co-enriched systems have a defective hexagonal close-packed (hcp) structure, which was described by a model which embedded cubic fragments of packaging into a hexagonal close-packed (hcp) structure. It has been shown that an increase in water content at the precipitation stage leads to a decrease in the size of cubic fragments and a more uniform distribution of them in Co-enriched systems. It has also been shown that mixed systems have the greatest coercivity in the line of samples. Ni-enriched bimetallic systems have a cubic close-packed (ccp) structure with modified crystal lattice parameters.

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Держатели документа:
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, Russia
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, 660041 Krasnoyarsk, Russia

Доп.точки доступа:
Nesterov, Nikolay; Pakharukova, Vera; Cherepanova, Svetlana; Yakushkin, Stanislav; Gerasimov, Evgeniy; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Martyanov, Oleg
}
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