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Общее количество найденных документов : 55
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1.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Beznosikov B. V., Vasil'ev A. D., Kruglik A. I.
Заглавие : Crystallographic classification of distortions in layer perovskite-like crystals of K2NiF4 type. Structural phase-transition in Rb2CdCl4
Коллективы : European crystallographic meeting
Место публикации : Phase Transit. - 1987. - Vol. 8, Is. 4. - P.352. - ISBN 0141-1594
Примечания : Cited References: 3
Предметные рубрики: Condensed Matter
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Vasil'ev A. D., Zvegintsev A. G., Lepeshev A. A., Петров, Михаил Иванович, Khabarov V. I., Khrustalev B. P.
Заглавие : Superconducting ceramic coating obtained by plasma spraying
Место публикации : Zhurnal Tek. Fiz. - 1989. - Vol. 59, Is. 8. - P.157-159. - ISSN 0044-4642
Примечания : Cited References: 3
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kruglik A. I., Vasil'ev A. D., Aleksandrov K. S.
Заглавие : The crystal-structure of rb2cdcl4 in paraelastic and ferroelastic phases
Место публикации : Phase Transit. - 1989. - Vol. 15, Is. 1. - P.69-76. - ISSN 0141-1594, DOI 10.1080/01411598908206838
Примечания : Cited References: 8
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Afanas'ev M. L., Balaev A. D., Vasil'ev A. D., Velikanov D. A., Ovchinnikov S. G., Petrakovskii G. A., Rudenko V. V.
Заглавие : New magnetically ordered CoBO3 crystal
Разночтения заглавия :авие SCOPUS: New magnetically ordered CoBo3 crystal
Место публикации : JETP Letters. - 2001. - Vol. 74, Is. 2. - P.82-83. - ISSN 0021-3640, DOI 10.1134/1.1405889
Примечания : Cited References: 5
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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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Sablina K. A., Pankrats A. I., Velikanov D. A., Balaev A. D., Bayukov O. A., Tugarinov V. I., Vorotynov A. M., Vasil'ev A. D., Romanenko G. V., Shvedenkov Y. G.
Заглавие : Synthesis of the new oxocuprate Cu5Bi2B4O14 and investigation of its structural, magnetic, and resonant properties
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 7. - P1339-1344. - ISSN 1063-7834, DOI 10.1134/1.1494633
Примечания : Cited References: 16
Предметные 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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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Bayukov O. A., Vasil'ev A. D., Velikanov D. A., Ivanova N. B., Kazak N. V., Ovchinnikov S. G., Abd-Elmeguid M. M., Rudenko V. V.
Заглавие : Magnetic and electrical properties of Fe1.91V0.09BO4 warwickite
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of Fe1.91V 0.09BO4 warwickite
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 97, Is. 5. - P989-995. - ISSN 1063-7761, DOI 10.1134/1.1633954
Примечания : 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)
Предметные рубрики: ELECTRONIC-STRUCTURE
CRYSTAL-STRUCTURE
FE2OBO3
CHAINS
FE2BO4
FEBO3
Ключевые слова (''Своб.индексиров.''): 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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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasil'ev A. D., Molokeev M. S., Golovnev N.N., Churilov G. N.
Заглавие : Preparation and crystal structure of hydrated crystalline complex of ciprofloxacin and copper tetrachloride
Место публикации : J. Struct. Chem. - 2005. - Vol. 46, Is. 2. - P.363-370. - ISSN 0022-4766, DOI 10.1007/s10947-006-0055-8
Примечания : Cited Reference Count: 16
Аннотация: Synthesis of a complex formed by ciprofloxacin (cfH) and copper(II) chloride is described; its crystal structure is reported and analyzed in comparison to related compounds. The obtained compound (ctH(3))CuCl4 center dot H2O (cfH(3)(2+) - double protonated cfH molecule) crystallizes as platelets of P2(1)/c symmetry having the unit cell parameters a = 13.491 (1) angstrom, b = 11.0459(7) angstrom, c = 16.299(1) angstrom; beta = 1.392(7)degrees. Carbonyl oxygen O(1) is protonated, and hydrogen atom combined with it forms an intramolecular hydrogen bond with carboxylic O(2) oxygen (O(1) center dot center dot center dot O(2) = 2.642(5) angstrom). Terminal nitrogen atom N(3) of the piperazinyl group is also protonated, and two its hydrogen atoms participate in hydrogen bonds of N-H center dot center dot center dot Cl type. The structure also has hydrogen bonds O-H center dot center dot center dot O, O-H... Cl with the participation of water molecules which occupy hydrophilic channels. Molecular ions cfH(3)(2+), make couples with intrapair pi center dot center dot center dot pi interactions.
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Fokina V. D., Molokeev M. S., Vasil'ev A. D., Bovina A. F., Laptash N. M.
Заглавие : Heat capacity, structural disorder, and the phase transition in cryolite (NH4)(3)Ti(O-2)F-5
Разночтения заглавия :авие SCOPUS: Heat capacity, structural disorder, and the phase transition in cryolite (NH4)3Ti(O2)F5
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 8. - P1559-1567. - ISSN 1063-7834, DOI 10.1134/S1063783406080221
Примечания : Cited References: 18
Предметные 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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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R. D., Vasil'eva I.G., Vasil'ev A. D., Bayukov O. A., Ivanova O. S., Prokof'ev D. E., Stepanov S.A., Kornilova E.E., Zerubina T.V., Malakhov V.V., Zaikovskii V.A.
Заглавие : Magnetic Nanoparticles in Oxide Glasses
Место публикации : Physics of Metals and Metallography. - 2006. - Vol. 102, Suppl. 1, Chapter 11. - P.S2-S7. - DOI 10.1134/S0031918X0614002X
Примечания : Библиогр.: 13. - Integrated Project of the Siberian Division of the Russian Academy of Sciences no. 88-2003, and by the Federal Program RNP, project no. 2.1.1.7376.
Аннотация: Unique properties of the potassium–aluminum–boron glasses doped with low concentrations of MnO and Fe2O3 to make them magnetically ordered and optically transparent in the IR and visible ranges are due to the formation of nanoparticles of a cubic ferrite. Assembling and properties of nanosized ferrite particles in the glasses have been investigated by X-ray diffraction, differential dissolution analysis, high-resolution transmission electron microscopy, Mössbauer spectroscopy, magnetic measurements, and magnetooptical Faraday effect. It was shown that the ferrite particles vary highly in size, shape, stoichiometry, structural perfection, and space distribution depending on the preparation conditions. A correlation between the characteristics of nanostructured ferrite particles and magnetic properties of glasses has been established.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova N. B., Vasil'ev A. D., Velikanov D. A., Kazak N. V., Ovchinnikov S. G., Petrakovski G. A., Rudenko V. V.
Заглавие : Magnetic and electrical properties of cobalt oxyborate Co3BO5
Разночтения заглавия :авие SCOPUS: Magnetic and electrical properties of cobalt oxyborate Co 3BO5
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 49, Is. 4. - P651-653. - ISSN 1063-7834, DOI 10.1134/S1063783407040087
Примечания : Cited References: 13
Предметные рубрики: LUDWIGITES
Аннотация: Single crystals of cobalt oxyborate Co3BO5 are synthesized. The results of investigations into the structural, magnetic, and electrical properties are reported. It is found that Co3BO5 crystals exhibit two magnetic anomalies at T (1) = 17 K and T (2) = 45 K. The temperature dependence of the electrical resistivity is investigated. Deviations both from the activation law of variation in the electrical resistance and from the Mott variable-range hopping conduction are revealed.
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