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Heat capacity, structural disorder, and the phase transition in cryolite (NH4)(3)Ti(O-2)F-5 / I. N. Flerov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 8. - P. 1559-1567, DOI 10.1134/S1063783406080221. - Cited References: 18 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PEROVSKITE-LIKE OXYFLUORIDES
   CRYSTAL-STRUCTURES
   (NH4)(3)TIOF5
   (NH4)(3)WO3F3
   DIFFRACTION
Аннотация: The heat capacity, T-p phase diagrams, and unit cell parameters of cryolite (NH4)(3)Ti(O-2)F-5 were studied over a wide temperature range. A phase transition was found near 226 K, and its thermodynamic characteristics and their dependence on the crystallization conditions were determined. The coordinates and thermal parameters of atoms in the Fm3m phase were refined. An analysis of the electron density distribution and the transition entropy showed that the mechanism of the structural transition involves, above all, rotation of the Ti(O-2)F-5 octahedra. Possible models of disordering of tetrahedral ammonium groups are considered.

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Chemistry, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russian Federation

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Gorev, M. V.; Горев, Михаил Васильевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Bovina, A. F.; Бовина, Ася Федоровна; Laptash, N. M.
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New magnetically ordered CoBO3 crystal / M. L. Afanas'ev [et al.] // JETP Letters. - 2001. - Vol. 74, Is. 2. - P. 82-83, DOI 10.1134/1.1405889. - Cited References: 5 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary

Аннотация: Crystals of a new CoBO3 compound were synthesized from a solution in melt. According to the X-ray diffraction data, CoBO3 crystallizes in the calcite structure with lattice parameters a(H) = 4.631 +/- 0.005, c(H) = 14.51 +/- 0.01 Angstrom. Measurements on SQUID and vibrating-coil magnetometers suggested that CoBO3 is a magnetically ordered crystal with a saturation magnetization of 50 emu/g in the basal plane at 4.2 K and a Neel temperature of 53 K. (C) 2001 MAIK "Nauka/Interperiodica".

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

Доп.точки доступа:
Afanas'ev, M. L.; Balaev, A. D.; Балаев, Александр Дмитриевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Petrakovskii, G. A.; Петраковский, Герман Антонович; Rudenko, V. V.; Руденко, Валерий Васильевич
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Synthesis of the new oxocuprate Cu5Bi2B4O14 and investigation of its structural, magnetic, and resonant properties / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 7. - P. 1339-1344, DOI 10.1134/1.1494633. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CUB2O4 COPPER METABORATE
FERROMAGNETISM
Аннотация: Single crystals of the new compound Cu5Bi2B4O14 are grown and its structural, magnetic, and resonant properties are investigated for the first time. It is found that the Cu5Bi2B4O14 crystal synthesized has a triclinic symmetry with space group P (1) over bar and the unit cell parameters a = 10.132 Angstrom, b = 9.385 Angstrom, c = 3.458 Angstrom, alpha = 105.443degrees, beta = 97.405degrees, gamma = 107.784degrees, and Z = 1. At a temperature of 24.5 K, the crystal undergoes a magnetic phase transition to the magnetically ordered state. The assumption is made that the ferrimagnetic structure of the Cu5Bi2B4O14 crystal consists of two ferromagnetic sublattices coupled through the antiferromagnetic exchange interaction. The unit cell of the crystal contains five copper ions, of which one ion belongs to the first sublattice and the other four ions form the second sublattice. Analysis of the resonant and magnetic static properties demonstrates that the Cu5Bi2B4O14 crystal exhibits an easy-axis magnetic anisotropy. The direction of the easy axis coincides with the c axis of the crystal, whereas the a and b axes are the hard magnetic axes with saturation fields approximately equal to 25 and 10 kOe, respectively. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Organ Chem, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Pankrats, A. I.; Панкрац, Анатолий Иванович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Tugarinov, V. I.; Тугаринов, Василий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Romanenko, G. V.; Shvedenkov, Y. G.
}
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Васильев, Александр Дмитриевич.
Кристаллическая структура [Bi(N-этилтиомочевина)4(ClO4)2]ClO4 / А. Д. Васильев, Н. Н. Головнев, М. К. Лесников // Журн. неорг. химии. - 2016. - Т. 61, № 6. - С. 740-743, DOI 10.7868/S0044457X16060222. - Библиогр.: 21 . - ISSN 0044-457X

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Переводная версия Vasil'ev A. D. Crystal structure of [Bi(N-ethylthiourea)4(ClO4)2]ClO4 [Текст] / A. D. Vasil’ev, N. N. Golovnev, M. K. Lesnikov // Russ. J. Inorg. Chem. : MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 61 Is. 6.- P.704-707

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

Доп.точки доступа:
Головнев, Николай Николаевич; Лесников, М. К.; Vasil'ev, A. D.
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Violation of axial symmetry of optical properties in the trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4) / A. V. Malakhovskii [et al.] // Phys. Lett. A. - 2009. - Vol. 373, Is. 18-19. - P. 1683-1686, DOI 10.1016/j.physleta.2009.03.019. - Cited References: 16. - The work was supported by the Russian Foundation for Basic Researches, grant No 07-02-00704. . - ISSN 0375-9601

РУБ Physics, Multidisciplinary
Рубрики:
IRON BORATE GDFE3(BO3)(4)
Кл.слова (ненормированные):
Optical anisotropy -- Spectroscopy -- Rare earth compounds -- Transition metal compounds -- Optical anisotropy -- Rare earth compounds -- Spectroscopy -- Transition metal compounds
Аннотация: Strong dependence of birefringence and absorption spectra of d-d, f-f and charge transfer transitions on the direction of light beam in the plane perpendicular to the threefold crystallographic axis has been found out in trigonal crystal Nd:GdFe2.1Ga0.9(BO3)(4). X-ray measurements have shown that the crystal consists of inversion twins, whose formation is stimulated by the partial substitution of Fe by Ga. Observed violation of axial symmetry of the trigonal crystal optical properties is accounted for on the basis of assumption about stripe domain structure of the inversion twins. (c) 2009 Elsevier B.V. All rights reserved.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, 660036 Krasnoyarsk, Russian Federation

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Zabluda, V. N.; Заблуда, Владимир Николаевич; Leont'ev, A. A.; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Russian Foundation for Basic Researches [07-02-00704]
}
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Magnetic properties of Pb2Fe2Ge2O9 single crystals / G. A. Petrakovskii [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 9. - P. 1853-1858, DOI 10.1134/S1063783409090145. - Cited References: 10 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MULTIFERROICS
Аннотация: Single crystals of Pb2Fe2Ge2O9 have been grown. They were subjected to X-ray diffraction, magnetic, neutron diffraction, Mossbauer and spin resonance studies. It has been established that Pb2Fe2Ge2O9 is a weak ferromagnet with a N,el temperature T (N) = 46 K, and the exchange and spin-flop transition fields have been estimated. It has been demonstrated that the weak ferromagnetic moment is actually the result of the single-ion anisotropy axes for the magnetic moments of different magnetic sublattices being not collinear.

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Держатели документа:
[Petrakovskii, G. A.
Popov, M. A.
Balaev, A. D.
Sablina, K. A.
Bayukov, O. A.
Velikanov, D. A.
Vorotynov, A. M.
Bovina, A. F.
Vasil'ev, A. D.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Petrakovskii, G. A.
Popov, M. A.
Bayukov, O. A.
Vasil'ev, A. D.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Boehm, M.] Inst Laue Langevin, F-38042 Grenoble 9, France
ИФ СО РАН

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Popov, M. A.; Balaev, A. D.; Балаев, Александр Дмитриевич; Sablina, K. A.; Саблина, Клара Александровна; Bayukov, O. A.; Баюков, Олег Артемьевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vorotynov, A. M.; Воротынов, Александр Михайлович; Bovina, A. F.; Бовина, Ася Федоровна; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Boehm, M.
}
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Magnetic and electrical properties of Fe1.91V0.09BO4 warwickite / A. D. Balaev [et al.] // J. Exp. Theor. Phys. - 2003. - Vol. 97, Is. 5. - P. 989-995, DOI 10.1134/1.1633954. - Cited References: 22. - This study was supported in part by the Russian Foundation for Basic Research (project no. 03-02-16286) and by the Federal Program “Integration” (project no. B0017) . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRONIC-STRUCTURE
   CRYSTAL-STRUCTURE
   FE2OBO3
   CHAINS
   FE2BO4
   FEBO3
Кл.слова (ненормированные):
Electric conductivity -- Magnetic variables measurement -- Magnetization -- Single crystals -- Hopping conductivity -- Warwickite -- Iron compounds
Аннотация: We have performed a complex investigation of the structure and the magnetic and electrical properties of a warwickite single crystal with the composition Fe1.91V0.09BO4 . The results of Mossbauer measurements at T = 300 K indicate that there exist "localized" (Fe2+, Fe3+) and "delocalized" (Fe2.5+) states distributed over two crystallographically nonequivalent positions. The results of magnetic measurements show that warwickite is a P-type ferrimagnet below T = 130 K. The material exhibits hopping conductivity involving strongly interacting electrons. The experimental data are analyzed in comparison to the properties of the initial (unsubstituted) Fe2BO4 warwickite. The entire body of data on the electric conductivity and magnetization are interpreted on a qualitative basis. (C) 2003 MAIK "Nauka / Interperiodica".

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Публикация на русском языке Магнитные и электрические свойства варвикита Fe[1.91]V[0.09]BO[4] [Текст] / А. Д. Балаев [и др.] // Журн. эксперим. и теор. физ. - 2003. - Т. 124 Вып. 5. - С. 1103-1111

Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660074, Russia
Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State Technical University, Krasnoyarsk, 660074, Russian Federation
Physikalisches Institut II, Universitat zu Koln, 50937 Koln, Germany

Доп.точки доступа:
Balaev, A. D.; Балаев, Александр Дмитриевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Ivanova, N. B.; Иванова, Наталья Борисовна; Kazak, N. V.; Казак, Наталья Валерьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Abd-Elmeguid, M. M.; Rudenko, V. V.; Руденко, Валерий Васильевич
}
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Preparation, microstructure, magnetic and transport properties of bulk textured Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O(x) and Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O(x)+Agceramics / M. I. Petrov [et al.] // Supercond. Sci. Technol. - 2008. - Vol. 21, Is. 10. - Ст. 105019, DOI 10.1088/0953-2048/21/10/105019. - Cited References: 22. - This work is supported by program of RAS 'Quantum macrophysics' No. 3.4 and integration project of SB RAS No. 3.4 and in part by Krasnoyarsk Regional Scientific Foundation (KRSF), Grants 17G057, 18G148 and 18G011. DAB and AAD acknowledge the Russian Science Support Foundation. . - ISSN 0953-2048

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   CRITICAL-CURRENT DENSITY
   BI-2223 TAPES
   BI2223
   SILVER
   DISCS
   (BI
Кл.слова (ненормированные):
Building materials -- Calcium -- Copper -- Crystallites -- Diamagnetic materials -- Lead -- Lead alloys -- Magnetic anisotropy -- Magnetic properties -- Nanocrystalline alloys -- Silver -- Textures -- Transport properties -- Bi-2223 -- Bulk samples -- Degree of textures -- Diamagnetic responses -- Liquid mediums -- Magnetic and transport properties -- Magnetic measurements -- Room temperatures -- Ceramic materials
Аннотация: A new method of preparation of bulk textured Bi2223 ceramics and Bi2223 + Ag composites, based on room temperature pressing of foamed precursor (Bi2223, Bi2223 + Ag) in a liquid medium, is proposed. SEM and XRD data prove a high degree of texture of the bulk samples obtained. Magnetic measurements performed in directions H parallel to c-axis and H parallel to a-b-planes of Bi2223 crystallites demonstrates anisotropy of magnetization confirming the texture of the ceramics. The materials obtained possess large diamagnetic response in the direction H parallel to a-b-planes of Bi2223 crystallites at both 77.4 and 4.2 K.

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Держатели документа:
[Petrov, M. I.
Shaikhutdinov, K. A.
Balaev, D. A.
Dubrovskii, A. A.
Popkov, S. I.
Vasil'ev, A. D.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Belozerova, I. L.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk, Russia
[Mart'yanov, O. N.] Boreskov Inst Catalysis, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036, Krasnoyarsk, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, 630090, Novosibirsk, Russian Federation

Доп.точки доступа:
Petrov, M. I.; Петров, Михаил Иванович; Belozerova, I. L.; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Popkov, S. I.; Попков, Сергей Иванович; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Mart'yanov, O. N.
}
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Investigation of the structure, physical properties, and phase transition in SrAlF5 / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 3. - P. 509-514, DOI 10.1134/S1063783410030108. - Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project no. 07-02-00442) and the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration Project No. 34. . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   BEHAVIOR
   GROWTH
   SRAIF5
Аннотация: Crystals of SrAlF5 have been grown by the Bridgman method from the melt and by sintering of the components. Optical polarization studies and measurements of the thermal expansion and birefringence coefficients have been carried out over a wide temperature range. The electromechanical coefficient d (33) has been measured, and the optical second harmonic, dielectric hysteresis loop, and optical quality of the crystal have been assessed. X-ray diffraction investigations have been performed to identify the revealed compounds. It has been demonstrated that the SrAlF5 crystals obtained under the growth conditions chosen have I4(1)/a symmetry and do not undergo structural phase transitions in the temperature range 100-800 K. Crystalline inclusions of the AlOF oxyfluoride have been revealed in crystals grown with an AlF3 excess. The birefringence of the AlOF crystal is an order of magnitude higher than that of SrAlF5, does not depend on temperature, and has no anomalies up to 800 K.

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Держатели документа:
[Mel'nikova, S. V.
Gorev, M. V.
Vasil'ev, A. D.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Isaenko, L. I.
Lobanov, S. I.] Russian Acad Sci, Trofimuk United Inst Geol Geophys & Mineral, Siberian Branch, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Trofimuk United Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Koptyuga 3, Novosibirsk 630090, Russian Federation

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Isaenko, L. I.; Gorev, M. V.; Горев, Михаил Васильевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Lobanov, S. I.
}
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10.

EPR study of the Jahn-Teller effect of Cu2+ ions in ZnGa2O4 / A. M. Vorotynov [et al.] // Phys. Solid State. - 2010. - Vol. 52, Is. 11. - P. 2415-2418, DOI 10.1134/S1063783410110314. - Cited References: 12 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
PARTICLES
CUFE2O4
Аннотация: The Jahn-Teller effect in the ZnGa2O4 spinel single crystal has been investigated using electron paramagnetic resonance of Cu2+ ions in the temperature range 110-560 K. It has been shown that copper ions occupy octahedral sites 16d in the ZnGa2O4 crystal with cubic symmetry O (h) (7) (Fd-3m). At T 560 K, the octahedra undergo tetragonal distortions (predominantly tension) and rotation around the fourfold axes by the angle theta a parts per thousand 2.6A degrees. The parameters of the spin Hamiltonian, which characterize the prolate (g (aEuro-)

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Держатели документа:
[Vorotynov, A. M.
Petrakovskii, G. A.
Sablina, K. A.
Bovina, A. F.
Vasil'ev, A. D.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Vorotynov, A. M.; Воротынов, Александр Михайлович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Sablina, K. A.; Саблина, Клара Александровна; Bovina, A. F.; Бовина, Ася Федоровна; Vasil'ev, A. D.; Васильев, Александр Дмитриевич
}
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