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    A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd / O. S. Ivanova [et al.] // J. Sib. Fed. Univ. Math. Phys. - 2016. - Vol. 9, Is. 4. - P. 459–462 ; Журн. СФУ. Сер. "Математика и физика", DOI 10.17516/1997-1397-2016-9-4-459-462. - Cited References: 6. - The work was supported partly by the RFBR, 14-02-01211-a, and by the President of Russia Grant NSh-7559.2016.2. . - ISSN 1997-1397
   Перевод заглавия: Сравнительное изучение γ-Fe2O3 и ϵ-Fe2O3 наночастиц, формирующихся в стекле, допированном железом и гадолинием
Кл.слова (ненормированные):
magnetic nanoparticles -- magnetic circular dichroism -- magnetic measurements -- магнитные наночастицы -- магнитный круговой дихроизм -- магнитные измерения
Аннотация: Formation and properties of the iron oxides γ -Fe2O3 and ϵ-Fe2O3 nanoparticles arising in glasses of basic compositions Ge2O-K2O-Al2O3-B2O3 and K2O-Al2O3-B2O3 doped with different concentrations of Fe2O3 and Gd2O3 and subjected to the additional thermal treatment are studied. The X-ray diffraction, TEM microscopy, magnetooptical effects, and electron spin resonance study allow elucidating the matrix and Gd role in determining the nanoparticle properties.
Изучены свойства наночастиц γ-Fe2O3 и ϵ-Fe2O3, формирующихся в стеклах основного состава Ge2O-K2O-Al2O3-B2O3 и K2O-Al2O3-B2O3, допированных Fe2O3 и Gd2O3 и подвергнутых дополни- тельной термической обработке. Результаты исследования рентгеновской дифракции, электрон- ной микроскопии, магнитооптических эффектов и электронного спинового резонанса позволили объяснить роль матрицы и гадолиния в определении свойств наночастиц.

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Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Edelman, I. S.; Эдельман, Ирина Самсоновна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна

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A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd / O. S. Ivanova [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P9.11. - P. 397. - References: 1. - The work was supported partly by the RFBR grant No. 14-02-01211 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
magnetic nanoparticles -- magnetic circular dichroism -- magnetic measurements

Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Edelman, I. S.; Эдельман, Ирина Самсоновна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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An analysis of the mechanism of Kerr effect enhancement in Mn/Dy/Bi / S. G. Ovchinnikov [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 1. - P. 80-86, DOI 10.1134/1.1130733. - Cited References: 35 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   THIN-FILMS
   MAGNETIC-PROPERTIES
   RARE-EARTH
   MAGNETOOPTICAL PROPERTIES
   MNBI FILMS
   STABILITY
   GD
Аннотация: A study is reported of the structural, magnetic, and magneto-optic properties of Mn/Dy/Bi films obtained by multilayer technology. The maximum Kerr rotation angle in such films is shown to be theta(k) = 2.25 degrees. Possible reasons for such a large Kerr effect enhancement are considered, namely, an increase in the 6p - 3d transition probability caused by symmetry distortion, polarization of the Bi6p band, and a change in the density of states near the Fermi level. The latter reason has been analyzed by simulating the electronic structure of Mn/Dy/Bi through superposition of Dy levels on the MnBi band structure. This approach has revealed possible additional transitions which may be induced by the presence of a Dy buffer and could contribute to the Kerr magneto-optic effect. (C) 1999 American Institute of Physics. [S1063=7834(99)02001-8].

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Публикация на русском языке Анализ механизма увеличения эффекта Керра в Mn/Dy/Bi [Текст] / С. Г. Овчинников [и др.] // Физ. тверд. тела. - С.-Петербург, 1999. - Т. 41 Вып. 1. - С. 91-97

Держатели документа:
Russian Acad Sci, LV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Burkova, L. V.; Буркова, Людмила Викторовна; Seredkin, V. A.; Середкин, Виталий Александрович; Yakovchuk, V. Y.
}
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Aplesnin, S. S.
Magnetoelectric Effect in a Paramagnetic Region in Gd0.15Mn0.85Se / S. S. Aplesnin, V. V. Kretinin, O. B. Begisheva // Phys. Solid State. - 2019. - Vol. 61, Is. 8. - P. 1379-1382, DOI 10.1134/S1063783419080067. - Cited References: 16. - This work was supported by the Russian foundation for Basic Research, the Government of the Krasnoyarsk region, and Krasnoyarsk Regional Foundation for Science in the framework of the scientific project no. 18-42-240001 "Inversion of the sign of components of the magnetoelectric tensor in temperature in neodymium-substituted bismuth ferrite-garnet films," grant MK 591.2019.2, and state task no. 3.5743.2017/6.7. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
MULTIFERROICS
Кл.слова (ненормированные):
magnetoelectric effect -- migration polarization -- hysteresis -- polarization
Аннотация: The electric polarization in a zero magnetic field and in a magnetic field of 12 kOe is measured in a GdxMn1 – xSe solid solution in the percolation concentration region in the temperature range 80–380 K. For composition x = 0.15, the polarization hysteresis and the dependence of the remanent polarization on magnetic field and temperature are determined. The hysteresis is explained in the model of migration polarization and the magnetoelectric effect is explained in the Maxwell–Wagner model.

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Публикация на русском языке Аплеснин, Сергей Степанович. Магнитоэлектрический эффект в парамагнитной области в Gd0.15Mn0.85Sе [Текст] / С. С. Аплеснин, В. В. Кретинин, О. Б. Бегишева // Физ. тверд. тела. - 2019. - Т. 61 Вып. 8. - С. 1433-1436

Держатели документа:
KSC SB RAS, Independent Subdiv Fed Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660000, Russia.

Доп.точки доступа:
Kretinin, V. V.; Begisheva, O. B.; Аплеснин, Сергей Степанович; Russian foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240001, MK 591.2019.2, 3.5743.2017/6.7]
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Aplesnin, S. S.
Nonadiabatic interaction of acoustic phonons with spins S=1/2 in the two-dimensional Heisenberg model / S. S. Aplesnin // J. Exp. Theor. Phys. - 2003. - Vol. 97, Is. 5. - P. 969-977, DOI 10.1134/1.1633952. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
QUANTUM MONTE-CARLO
   EU2CUO4
   GD2CUO4
   POLARON
Кл.слова (ненормированные):
Antiferromagnetic materials -- Correlation methods -- Crystal symmetry -- Magnetic couplings -- Magnetic moments -- Magnetization -- Monte Carlo methods -- Quantum theory -- Acoustic phonons -- Nonadiabatic interaction -- Orthorhombicity -- Quantum spin liquid transitions -- Phonons
Аннотация: The ground state of a two-dimensional antiferromagnet having spins S = 1/2 and interacting with acoustic phonons is investigated in the nonadiabatic approximation using the quantum-mechanical Monte Carlo method. The critical parameters of the spin-phonon coupling, corresponding to the formation of bound spin-phonon excitations, crystal symmetry lowering, and the emergence of a gap in the spin excitation spectrum, as well as the antiferromagnet-quantum spin liquid transition, are determined. The orthorhombicity parameter, the sublattice magnetization, the violation of the spherical symmetry of spin-spin correlation functions, and the magnetic moment in Gd2CuO4 and Eu2CuO4 are calculated. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgoivdok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Аплеснин, Сергей Степанович
}
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Change of the local magnetic properties during f-f transitions in multiferroic Nd0.5Gd0.5Fe3(BO3)4 single crystal / A. V. Malakhovskii [et al.] // Ultrafast magnetism conf. (UMC 2015) : program. - Nijmegen, 2015

Материалы конференции

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович; Ultrafast Magnetism Conference(2015 ; okt. ; 19-23 ; Nijmengen, Netherlands)
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    Changes of the local magnetic properties of the optically excited Nd3+ ions and their manifestation in the near IR spectra of the Nd0.5Gd0.5Fe3(BO3)4 crystal / A. V. Malakhovskii [et al.] // Opt. Mater. - 2016. - Vol. 52. - P. 126-133, DOI 10.1016/j.optmat.2015.12.029. - Cited References: 29. - The work was supported by the Russian Foundation for Basic Researches Grant 16-02-00273 and by the President of Russia Grant No. Nsh-2886.2014.2. . - ISSN 0925-3467. - ISSN 1873-1252
   Перевод заглавия: Изменения локальных магнитных свойств оптически возбужденных ионов Nd3+ и их проявление в ближних ИК-спектрах кристалла Nd0.5Gd0.5Fe3(BO3)4

РУБ Materials Science, Multidisciplinary + Optics
Рубрики:
SINGLE-CRYSTAL
GdFe3(BO3)4
STATES
Кл.слова (ненормированные):
f-f transitions -- Nd3+ ion -- Excited states -- Local magnetic properties
Аннотация: Polarized absorption spectra of f–f transitions 4I9/2 → 4F3/2 and (2H9/2 + 4F5/2) in the Nd3+ ion in the Nd0.5Gd0.5Fe3(BO3)4 single crystal were studied as a function of temperature in the range of 2–40 K and as a function of magnetic field in the range of 0–65 kOe at 2 K. It was found out that the selection rules for f–f electron transitions substantially changed in the magnetically ordered state of the crystal, and they strongly depended on the orientation of the Fe and Nd ions magnetic moments relative to the light polarization. The splitting of the ground and excited states of the Nd3+ ion in the exchange field of the Fe sublattice were determined. It was revealed that the value of the exchange splitting (the exchange interaction) in the excited states did not correlate with the theoretical Landé factors. The Landé factors of the excited states were experimentally found. In general, the local magnetic properties in the vicinity of the excited ion depend substantially on its electron state. In particular: (1) in one of the excited states a weak ferromagnetic moment appears, (2) the changes of type of the local magnetic anisotropy take place in some excited states, and (3) in some excited states the energetically favorable orientation of the Nd3+ ion magnetic moment is opposite to that in the ground state. In some excited states the nonequivalent Nd3+ centers were found out.
Поляризованные спектры поглощения F-е переходов 4I9/2 → 4F3/2 и (2H9/2 + 4F5/2) в иона Nd3+ в Nd0.5Gd0.5Fe3(BO3)4 монокристалл изучались как функции температуры в интервале 2-40 K и в зависимости от магнитного поля в диапазоне 0-65 кЭ при 2 К. Выяснилось, что Правила отбора для F-F электронных переходов существенно изменился в магнитно-упорядоченном состоянии кристалла, и они сильно зависели от ориентации магнитных моментов ионов Fe и Nd по отношению к поляризация света. Расщепление основного и возбужденного состояний иона Nd3+ в обменном поле подрешетки Fe были определены. Было выявлено, что величина обменного расщепления (обменное взаимодействие) в возбужденных состояниях не коррелируют с теоретическими факторами Ланде. Факторы Ланде возбужденных состояний были найдены экспериментально. В целом, локальные магнитные свойства в непосредственной близости от возбужденного иона существенно зависят от его электронного состояния. В частности: (1) в одном из возбужденной состояния появляется слабый ферромагнитный момент, (2) изменения типа локальных магнитной анизотропии происходит в некоторых возбужденных состояниях, и (3) в некоторых возбужденных состояниях энергетически благоприятных ориентация иона Nd3+ магнитного момента противоположны тем, что в основном состоянии. В некоторых возбужденных состояниях были обнаружены неэквивалентные центры Nd3+.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia.
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine.

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Temerov, V. L.; Темеров, Владислав Леонидович; Russian Foundation [16-02-00273]; [Nsh-2886.2014.2]
}
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    Comparative investigations of the crystal structure and photoluminescence property of eulytite-type Ba3Eu(PO4)3 and Sr3Eu(PO4)3 / H. P. Ji [et al.] // Dalton Trans. - 2015. - Vol. 44, Is. 16. - P. 7679-7686, DOI 10.1039/c4dt03887h. - Cited References:65. - This work was supported by the National Natural Science Foundations of China (grant no. 51032007, no. 51002146, no. 51272242), the Research Fund for the Doctoral Program of Higher Education of China (grant no. 20130022110006), Natural Science Foundations of Beijing (2132050), and the Program for New Century Excellent Talents in the University of the Ministry of Education of China (NCET-12-0950), Beijing Nova Program (Z131103000413047) and Beijing Youth Excellent Talent Program (YETP0635). VVA is partly supported by the Ministry of Education and Science of the Russian Federation. . - ISSN 1477. - ISSN 1477-9234
   Перевод заглавия: Сравнительный анализ кристаллических структур и люминесцентных свойств Ba3Eu(PO4)3 и Sr3Eu(PO4)3. со структурой эвлитина

РУБ Chemistry, Inorganic & Nuclear
Рубрики:
LIGHT-EMITTING-DIODES
DOPED Sr3Gd(PO4(3 PHOSPHOR
EFFICIENT
Аннотация: In this study, the Ba3Eu(PO4)3 and Sr3Eu(PO4)3 compounds were synthesized and the crystal structures were determined for the first time by Rietveld refinement using powder X-ray diffraction (XRD) patterns. Ba3Eu(PO4)3 crystallizes in cubic space group I3d, with cell parameters of a = 10.47996(9) Å, V = 1151.01(3) Å3 and Z = 4; Ba2+ and Eu3+ occupy the same site with partial occupancies of 3/4 and 1/4, respectively. Besides, in this structure, there exists two distorted kinds of the PO4 polyhedra orientation. Sr3Eu(PO4)3 is isostructural to Ba3Eu(PO4)3 and has much smaller cell parameters of a = 10.1203(2) Å, V = 1036.52(5) Å3. The bandgaps of Ba3Eu(PO4)3 and Sr3Eu(PO4)3 are determined to be 4.091 eV and 3.987 eV, respectively, based on the UV–Vis diffuse reflectance spectra. The photoluminescence measurements reveal that, upon 396 nm n-UV light excitation, Ba3Eu(PO4)3 and Sr3Eu(PO4)3 exhibit orange-red emission with two main peaks at 596 nm and prevailing 613 nm, corresponding to the 5D0 → 7F1 and 5D0 → 7F2 transitions of Eu3+, respectively. The dynamic disordering in the crystal structures contributes to the broadening of the luminescence spectra. The electronic structure of the phosphates was calculated by the first-principles method. The analysis elucidats that the band structures are mainly governed by the orbits of phosphorus, oxygen and europium, and the sharp peaks of the europium f-orbit occur at the top of the valence bands.

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Держатели документа:
China Univ Geosci, Sch Mat Sci & Technol, Natl Lab Mineral Mat, Beijing Key Lab Mat Utilizat Nonmetall Minerals &, Beijing 100083, Peoples R China.
Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China.
SB RAS, LV Kirensky Phys Inst, Lab Crystal Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
Chinese Acad Sci, Tech Inst Phys & Chem, Beijing Ctr Crystal R&D, Key Lab Funct Crystals & Laser Technol, Beijing 100190, Peoples R China.
Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Russian Acad Sci, Inst Semicond Phys, SB RAS, Lab Opt Mat & Struct, Novosibirsk 630090, Russia.
Tomsk State Univ, Funct Elect Lab, Tomsk 634050, Russia.
Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia.

Доп.точки доступа:
Ji, Haipeng; Huang, Zhaohui; Xia, Zhiguo; Molokeev, M. S.; Молокеев, Максим Сергеевич; Jiang, Xingxing; Lin, Zheshuai; Atuchin, V. V.
}
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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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10.

Crystal growth of ReCa3Mn3O3(BO3)4 (Re = Gd, Y) gaudefroyite: Phase sequence and equilibrium study in multi-component fluxes / E. Moshkina, N. Belskaya, Z. Bashleev [et al.] // J. Cryst. Growth. - 2022. - Vol. 600. - Ст. 126917, DOI 10.1016/j.jcrysgro.2022.126917. - Cited References: 32. - The study was supported by the Russian Science Foundation (grant No. 21-72-00130). The X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0022-0248
Кл.слова (ненормированные):
Phase equilibria -- Growth from solutions -- Borates -- Gaudefroyites
Аннотация: The work is aimed at studying the crystallization of ReCa3Mn3O3(BO3)4 (Re = Gd, Y) borates with the gaudefroyite structure in different flux systems. Gaudefroyites are promising materials in the field of spin ice and magnetocaloric effect. The study has been performed on systems based on the following solvents: Bi2Mo3O12-Na2B4O7-B2O3, Bi2O3-Na2B4O7-B2O3, Bi2O3-BaO-Na2B4O7-B2O3, Li2WO4-Li2O-B2O3. The influence of the solvent components on the sequence of high-temperature crystallizing phases has been studied. The feature of Mo- and W-containing fluxes consisting in the formation of stable chemical bonds of the M2+Mo(W)O4 (M = Ca, Mn) molybdate or tungstate types has been revealed which prevents the formation of gaudefroyite type bonds. An approach has been suggested for changing the sequence of the crystallizing phases which consists in the super saturation of molybdate (tungstate) bonds by Na+ or Li+ cations up to the formation of delafossite-type bonds (Li(Na)-Mn-O phase) with higher manganese valence states Mn3+ and Mn4+. The optimization of the growth conditions of ReCa3(MnO)3(BO3)4 (Re = Gd, Y) gaudefroyite crystals has allowed one to obtain single crystal samples with the size up to 0.8 × 0.8 × 5 mm3. The structural characterization and chemical composition of all the obtained phases are also presented.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Ioffe Institute, Saint Petersburg, 194021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660049, Russian Federation
Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Belskaya, N.; Bashleev, Z.; Башлеев, Зоригто Егорович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Soloviev, L.; Shabanova, K.
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