Библиотека института физики им. Л.В. Киренского СО РАН

Главная

Базы данных

Труды сотрудников ИФ СО РАН - результаты поиска

Вид поиска

Каталог книг и брошюр библиотеки ИФ СО РАН

Каталог журналов библиотеки ИФ СО РАН

Труды сотрудников ИФ СО РАН

Область поиска

в найденном

Найдено в других БД:

Каталог книг и брошюр библиотеки ИФ СО РАН (57)

Каталог журналов библиотеки ИФ СО РАН (3)

Формат представления найденных документов:
полный	информационный	краткий

Отсортировать найденные документы по:
автору	заглавию	году издания	типу документа

Поисковый запрос: (<.>K=Crystallography<.>)

Общее количество найденных документов : 58
Показаны документы с 1 по 20

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrov K. S., Gabuda S. P., Mikhailov G. M.
Заглавие : [Заглавие не известно]
Коллективы : International Union of Crystallography, Международный конгресс кристаллографов, General Assembly of the International Union of Crystallography, International Congress of the International Union of Crystallography, Symposia of the International Union of Crystallography
Место публикации : [Заглавие источника публикации не известно]; \b Тезисы докладов на 6 Международном конгрессе кристаллографов. - Рим, 1963
Примечания : см. "Основные научные достижения Ин-та физики им. Л.В. Киренского. 1957-1971". - С. 18, 82 (№52)
Материалы о конгрессе
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Gudim I. A., Ovchinnikova, Elena N., Kozlovskaya, Ksenia A., Wilhelm, Fabrice, Rogalev, Andrei, Hen, Amir, Ivanov, Vsevolod Y., Mukhin, Alexander A., Dmitrienko, Vladimir E.
Заглавие : X-ray Natural Circular Dichroism imaging of multiferroic crystals
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-72-00002, 16-12-10531]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-12029, 19-02-00483]; Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS
Место публикации : Crystals. - 2021. - Vol. 11, Is. 5. - Ст.531. - ISSN 2073-4352, DOI 10.3390/cryst11050531
Примечания : Cited References: 70. - This research was funded by the Russian Science Foundation (grant 19-72-00002). K.A.K. acknowledges support from the Russian Foundation for Basic Research (project no. 19-52-12029 and project no. 19-02-00483). V.E.D. was partly supported by the Ministry of Science and Higher Education of the Russian Federation within the State assignment FSRC "Crystallography and Photonics" RAS. V.Y.I. and A.A.M. were supported by the Russian Science Foundation [grant 16-12-10531]
Предметные рубрики: OPTICAL-ACTIVITY
MAGNETOELASTIC PROPERTIES
SINGLE-CRYSTAL
Аннотация: The polarizing spectroscopy techniques in visible range optics have been used since the beginning of the 20th century to study the anisotropy of crystals based on birefringence and optical activity phenomena. On the other hand, the phenomenon of X-ray optical activity has been demonstrated only relatively recently. It is a selective probe for the element-specific properties of individual atoms in non-centrosymmetric materials. We report the X-ray Natural Circular Dichroism (XNCD) imaging technique which enables spatially resolved mapping of X-ray optical activity in non-centrosymmetric materials. As an example, we present the results of combining micro-focusing X-ray optics with circularly polarized hard X-rays to make a map of enantiomorphous twinning in a multiferroic SmFe3(BO3)4 crystal. Our results demonstrate the utility and potential of polarization-contrast imaging with XNCD as a sensitive technique for multiferroic crystals where the local enantiomorphous properties are especially important. In perspective, this brings a novel high-performance method for the characterization of structural changes associated with phase transitions and identification of the size and spatial distribution of twin domains.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Александров, Кирилл Сергеевич, Клевцов П. В., Неронова Н. Н.
Заглавие : V Международный конгресс по кристаллографии
Коллективы : International Union of Crystallography, International Congress of the International Union of Crystallography, General Assembly of the International Union of Crystallography, Symposia of the International Union of Crystallography
Место публикации : Журн. структ. химии/ , International Congress of International Union of Crystallography (5 ; 1960 ; Cambride). - 1960. - Т. 1, № 4: Хроника. - С. 504-507. - ISSN 0136-7463
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavryushkin P. N., Popov Z. I., Litasov K. D., Gavryushkin A.
Заглавие : Unbiased crystal structure prediction of NiSi under high pressure
Место публикации : J. Appl. Crystallogr.: Wiley-Blackwell, 2015. - Vol. 48, No. 3. - P.906-908. - ISSN 0021, DOI 10.1107/S1600576715005488. - ISSN 16005767(eISSN)
Примечания : Cited References:29. - We thank the Information Technology Centre of Novosibirsk State University for providing access to the cluster computational resources. The research was financially supported by the Russian Science Foundation (grant No. 14-17-00601) and performed under the program of the Ministry of Education and Science of Russia (project No. 14.B25.31.0032). The work of ZIP is supported by the Leading Science School program (No. NS-2886.2014.2).
Предметные рубрики: AUGMENTED-WAVE METHOD
PHASE-TRANSITIONS
STABILITY
EQUATIONS
STATE
Ключевые слова (''Своб.индексиров.''): earth's core--pressure--ab initio calculations--fesi--nisi--cosi--mnsi--isomorphism
Аннотация: On the basis of an unbiased structure prediction, it is shown that the stable form of NiSi under pressures of 100 and 200 GPa is the Pmmn structure. Furthermore, a new stable phase has been discovered: the deformed tetragonal CsCl-type structure with a = 2.174 Å and c = 2.69 Å at 400 GPa. Specifically, the sequence of high-pressure phase transitions is the following: the Pmmn structure below 213 GPa, the tetragonal CsCl type in the range 213–522 GPa, and cubic CsCl higher than 522 GPa. As the CsCl-type structure is considered as the model structure of the FeSi compound at the conditions of the Earth's core, this result implies restrictions on the Fe–Ni isomorphic miscibility in FeSi.
Смотреть статью,
Смотреть статью (Wiley Online Library),
Scopus,
WOS
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Burkov S. I., Sorokin B. P., Glushkov D. A., Aleksandrov K. S.
Заглавие : Theory and computer simulation of the reflection and refraction of bulk acoustic waves in piezoelectrics under the action of an external electric field
Место публикации : Crystallogr. Rep. - 2005. - Vol. 50, Is. 6. - P.986-993. - ISSN 1063-7745, DOI 10.1134/1.2132408
Примечания : Cited References: 11
Аннотация: The basic equations describing the conditions for reflection and refraction of bulk acoustic wave at the interface between acentric crystals subjected to the action of a uniform external electric field are reported. Numerical analysis of the effect of this field on the reflection and refraction anisotropy of bulk acoustic waves at the crystal/vacuum and piezoelectrie/elastic-isotropic-medium interfaces is performed. (C) 2005 Pleiades Publishing, Inc.
WOS,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Bogdanov E. V., Laptash N. M.
Заглавие : The role of chemical pressure in the formation of the structure and barocaloric properties of complex fluorides and oxyfluorides
Колич.характеристики :14 с
Место публикации : Crystallogr. Rep. - 2023. - Vol. 68, Is. 5. - P.765-778. - ISSN 10637745 (ISSN), DOI 10.1134/S1063774523600485. - ISSN 1562689X (eISSN)
Примечания : Cited References: 67
Аннотация: The role of chemical pressure as an effective tool in the processes of formation of initial and distorted (as a result of structural transformations) phases, thermodynamic properties, and direct and inverse barocaloric effects in some complex oxyfluorides and fluorides with octahedral, tetrahedral, and spherical anion and cation groups in the structure has been studied. It is found that, due to the small temperature hysteresis and high baric sensitivity of materials, the maximum values of absolute and integral barocaloric characteristics can be implemented at low pressures. Correspondingly, the temperature range of reversibility of thermodynamic cycles based on fluorides/oxyfluorides as solid-state coolants can be expanded.
Смотреть статью,
Scopus,
WOS
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : The incommensurate magnetic structure of a tetragonal antiferromagnet with antisymmetric exchange
Место публикации : J. Exp. Theor. Phys. - 2009. - Vol. 109, Is. 6. - P.979-988. - ISSN 1063-7761, DOI 10.1134/S1063776109120097
Примечания : Cited References: 34
Предметные рубрики: FLUCTUATION-INDUCED PHASE
FIELD-INDUCED GAP
COPPER METABORATE
WEAK FERROMAGNETISM
SOLITON LATTICE
SPIN-WAVES
CUB2O4
BA2CUGE2O7
CSCUCL3
CHAINS
Ключевые слова (''Своб.индексиров.''): anti-symmetric--antiferromagnetic sublattices--antiferromagnets--antisymmetric exchange--exchange bonds--ferromagnetic component--ferromagnetic moments--ginzburg-landau functional--incommensurate magnetic structures--mean field approximation--modulation vectors--polarization planes--polarization vectors--symmetry groups--antiferromagnetic materials--antiferromagnetism--crystal orientation--crystal symmetry--ferromagnetic materials--ferromagnetism--magnetic devices--magnetic structure--modulation--polarization--vector spaces--vectors--crystallography
Аннотация: Analysis of the incommensurate magnetic structure that emerges for two coexisting types of the antisymmetric Dzyaloshinski-Moriya exchange interaction (the weakly ferromagnetic component of vector D along the tetragonal axis and the helicoidal component distributed in the tetragonal plane) is carried out for the first time for a tetragonal antiferromagnet. The helicoidal component for each pair of interacting spins has a 2D distribution; its direction in the tetragonal plane depends on the direction of the exchange bond in each pair. The Lifshits invariant of the Ginzburg-Landau functional is obtained, which is responsible for the formation of an incommensurate magnetic structure for such a distribution. It is shown in the mean field approximation that the incommensurate magnetic structure that forms in this case is a nonlinear double helicoid with a modulation vector lying in the tetragonal plane and with a varying angle between the polarization planes of quasi-antiferromagnetic sublattices. The ground state of the magnet is degenerate in the orientation of the modulation vector in the tetragonal plane. The rate of variation in the orientations of moments in the polarization planes passing through the tetragonal axis is controlled by the angle between the directions of the moments and the tetragonal axis. The local weakly ferromagnetic moment remaining in the polarization plane varies in magnitude and sign. The relation between the orientations of the modulation and polarization vectors is derived for the cases of simple and inversion tetragonal axes in the space symmetry group of the crystal.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zobov V. E., Popov M. A.
Заглавие : The coordinate of a singular point of the time correlation functions for a heteronuclear spin system of a crystal
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 100, Is. 4. - P775-783. - ISSN 1063-7761, DOI 10.1134/1.1926438
Примечания : Cited References: 24
Предметные рубрики: FLUCTUATION SPECTRUM
CROSS-RELAXATION
NMR ABSORPTION
SHAPE
WINGS
LINE
Ключевые слова (''Своб.индексиров.''): correlation methods--crystal lattices--crystallography--functions--integral equations--lithium compounds--nuclear magnetic resonance--quantum theory--random processes--autocorrelation functions (acf)--dipole-dipole interactions (ddi)--heteronuclear spin systems--self-consistent fluctuating field (scff)--crystals
Аннотация: The singularities of the time autocorrelation functions (ACFs) for a heteronuclear spin system of a crystal are investigated. Exact expressions are obtained for ten moments of the spectra of ACFs in the approximation of a self-consistent fluctuating field (SCFF) with arbitrary axial symmetry. These expressions are applied to determine the coordinate of the lowest singular point of these functions on the imaginary-time axis for a spin system with a dipole-dipole interaction (DDI). The leading corrections to this coordinate due to the correlation of local fields in real crystals are calculated. These corrections are determined by lattice sums with triangles of four bonds and pairs of four bonds. Numerical values of the coordinate are obtained for a LiF crystal in a magnetic field directed along three crystallographic axes. An increase in the coordinate of the singular point, which follows from the theory and leads to a faster falloff of the wings of the ACF spectra, qualitatively agrees with experiment. © 2005 Pleiades Publishing, Inc.
WOS,
Scopus,
Читать в сети ИФ
Найти похожие

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Petrakovskii G. A., Vorotynov A. M., Velikanov D. A., Udod L. V.
Заглавие : Synthesis, crystal structure, and magnetic properties of a Li8FeSm22O38 single crystal
Место публикации : Crystallogr. Rep.: Pleiades Publishing, 2013. - Vol. 58, Is. 2. - P.234-236. - DOI 10.1134/S1063774512060065
Аннотация: Li8FeSm22O38 single crystals have been grown by spontaneous flux crystallization, and their structure has been identified by X&ray diffraction analysis as follows: cubic crystals, a = 11.9078(5) A, sp. gr. Im3m, Z = 2. Fe atoms occupy two mixed positions. Magnetic ions have different ligand environments: a regular&&octahedron (Sm/Fe)O6, a three-cap trigonal prism SmO9, and a square antiprism SmO8. The rather low Neel&&temperature (3 K) can be explained by the considerable variation in the angles and lengths of exchange cou&&&plings between magnetic ions.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Successive structural phase-transitions in layered perovskite-like crystals .1. Crystals of the TLALF4 type
Место публикации : Kristallografiya: Международная книга, 1987. - Vol. 32, Is. 3. - P.661-672. - ISSN 0023-4761; Crystallogr. Rep.
Примечания : Cited References: 28
WOS
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E. S., Alekseeva O. A., Dudka A. P., Verin I. A., Artemov V. V., Bezmaternykh L. N., Gudim I. A., Frolov K. V., Lyubutin I. S.
Заглавие : Structure of Gd0.95Bi0.05Fe3(BO3)4single crystals at 293 and 90 K
Место публикации : Crystallogr. Rep.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 61, Is. 4. - P.558-565. - ISSN 10637745 (ISSN), DOI 10.1134/S1063774516040192
Примечания : Cited References: 27. - This study was performed using the equipment of the Center of Collective Use of the Shubnikov Institute of Crystallography of the Russian Academy of Sciences and it was supported by the Ministry of Education and Science of the Russian Federation (Project RFMEFI62114X0005) and in part by the Russian Foundation for Basic Research (Grant nos. 14-02-00483 and 14-02-00307) and the Federal Program on Support of Leading Scientific Schools (Grant no. NSh-6617.2016.5).
Предметные рубрики: TRIGONAL GdFe3(BO3)4
PHASE-TRANSITIONS
IRON
Аннотация: The structure of GdFe3(BO3)4 single crystals has been studied by X-ray diffraction at 293 and 90 K. The crystals are grown from a flux in the Bi2Mo3O12–B2O3–Li2MoO4–Gd2O3–Fe2O3 system. The results of chemical analysis and structural study show that these crystals contain bismuth as an impurity. It is found that bismuth atoms are located at gadolinium sites in the structure. A decrease in the temperature is accompanied by a lowering of the symmetry from sp. gr. R32 (at 293 K) to sp. gr. P3121 (at 90 K). The presence of two types of iron chains with different geometries at 90 K promotes a change in the magnetic properties of these crystals with a decrease in the temperature. © 2016, Pleiades Publishing, Inc.
Смотреть статью,
Scopus,
WOS,
Читать в сети ИФ
Найти похожие

12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrova I. P., Primak S. V., Shemetov E. V., Kruglik A. I.
Заглавие : Structural phase transitions in Ag1ϝyCu1fyx (where y=0,05; x=S, Se, Te)
Коллективы : European crystallographic meeting, Академия наук СССР, Институт кристаллографии АН СССР, International Union of Crystallography
Место публикации : Twelfth European Crystallographic Meeting: collected abstracts in 3 vols. - Moscow, 1989. - Vol. 1. - P.154
Примечания : Cited References: 2
Найти похожие

13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smirnova E., Alekseeva O. A., Dudka A. P., Verin I. A., Artemov V. V., Khmelenin D. N., Gudim I. A., Frolov K. V., Lyubutin I. S.
Заглавие : Structural peculiarities of bismuth-containing RFe3(BO3)4 (R = Ho, Y, Sm, Nd)
Коллективы : Congress of the International Union of Crystallography , Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
Место публикации : Acta Crystallogr. A. - 2021. - Vol. 77, Supplement. - P.C1237-C1237. - ISSN 2053-2733, DOI 10.1107/S0108767321084749
Примечания : Cited References: 4. - This work was performed using the equipment of the Shared Research Center FSRC 'Crystallography and Photonics' RAS and was supported by the Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Malakhovskii A. V., Gnatchenko S. L., Kachur I. S., Piryatinskaya V. G., Sukhachev A. L., Sokolov A. E., Strokova A. Ya., Kartashev A. V., Temerov V. L.
Заглавие : Spectroscopic manifestations of local crystal distortions in excited 4f states in crystals of huntite structure
Место публикации : Crystallogr. Rep. - 2013. - Vol. 58, Is. 1. - P.135–138. - DOI 10.1134/S1063774513010227
Аннотация: Optical absorption spectra of YbAl3(BO3)4, TmAl3(BO3)4 and TbFe3(BO3)4 trigonal crystals have been studied in temperature range 2–300 K. Temperature behavior of absorption lines parameters has shown, that during some f-f transitions the local environment of rare earth ions undergo distortions, which are absent in the ground state.Оптические спектры поглощения YbAl3(BO3)4, TmAl3(BO3)4 и TbFe3(BO3)4 треугольные кристаллы были изученны в диапазоне температуры 2–300 K. Температурное поведение параметров линий поглощения показало, что во время некоторых f–f переходов, окружение редких земных ионов подвергается искажениям, которые отсутствуют в обычном состоянии.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Pankrats A. I., Durnaikin E. I., Petrakovskii G. A., Bezmaternykh L. N., Szymczak R., Baran M.
Заглавие : Single-crystal growth of trigonal DyFe3(BO3) 4 and study of magnetic properties
Место публикации : Crystallography Reports. - Москва: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд), 2008. - Т. 53, № 7. - С. 1140-1143. - ISSN 1063-7745, DOI 10.1134/S1063774508070080. - ISSN 1562-689X(eissn)
РИНЦ
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Novak D. M., Smirnov L. S., Kolesnikov A. I., Voronin V. I., Berger I. F., Laptash N. M., Vasil'ev A. D., Flerov I. N.
Заглавие : Refinement of the crystal structure of the high-temperature phase G 0 in (NH4)2WO2F4 (powder, X-ray, and neutron scattering)
Место публикации : Crystallogr. Rep. - 2013. - Vol. 58, Is. 1. - P.129-134. - DOI 10.1134/S1063774513010240
Аннотация: The (NH4)2WO2F4 compound undergoes a series of phase transitions: G 0 → 201, K → G 1 → 160, and K → G 2, with a significant change in entropy (ΔS 1 ∼ Rln10 at the G 0 → G 1 transition), which indicates significant orientational disordering in the G 0 phase and the order-disorder type of the phase transition. X-ray diffraction is used to identify the crystal structure of the G 0 phase as rhombohedral (sp. gr. Cmcm, Z = 4), determine the lattice parameters and the positions of all atoms (except hydrogen), and show that [WO2F4]2− ions can form a superposition of dynamic and static orientational disorders in the anionic sublattice. A determination of the orientational position of [NH4]+ ions calls for the combined method of elastic and inelastic neutron scattering. Inelastic neutron scattering is used to determine the state of hindered rotation for ammonium ions in the G 0 phase. Powder neutron diffraction shows that the orientational disorder of NH4 ions can adequately be described within the free-rotation approximation.
Смотреть статью,
WOS,
Читать в сети ИФ
Найти похожие

17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Shemetov E. V., Aleksandrova I. P., Serebrennikov V. L.
Заглавие : Pressure-temperature phase diagram of incommensurate Rb2ZnBr4
Коллективы : European crystallographic meeting, Академия наук СССР, Институт кристаллографии АН СССР, International Union of Crystallography
Место публикации : Twelfth European Crystallographic Meeting: collected abstracts in 3 vols. - Moscow, 1989. - Vol. 1. - P.526
Примечания : Cited References: 3
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S.
Заглавие : Phase-transitions and distortions of the structure in the family of crystals related to alpha-k2so
Место публикации : Kristallografiya. - 1993. - Vol. 38, Is. 1. - P.128-139. - ISSN 0023-4761; Crystallogr. Rep.
Примечания : Cited References: 38
Предметные рубрики: X-RAY
EXPECTED STRUCTURES
A2BX4 COMPOUNDS
TEMPERATURE
(NH4)2BEF4
CHEMISTRY
DISORDER
SYMMETRY
WOS
Найти похожие

19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Aleksandrov K. S., Tressaud A., Grannec J., Couzi M.
Заглавие : Phase transitions in elpasolites (ordered perovskites)
Место публикации : Materials Science and Engineering R: Reports. - 1998. - Vol. 24, Is. 3. - P.81-151. - ISSN 0927-796X
Примечания : Cited References: 174
Предметные рубрики: ELASTIC NEUTRON-DIFFRACTION
MII = CO
RAMAN-SCATTERING
THERMODYNAMIC PROPERTIES
CRYSTAL-STRUCTURE
SINGLE-CRYSTALS
RB2KMIIIF6 ELPASOLITES
CUBIC PEROVSKITES
TEMPERATURE FORM
HIGH-RESOLUTION
Ключевые слова (''Своб.индексиров.''): crystal atomic structure--crystal growth--crystal lattices--crystallization--crystallography--ferroelectricity--hydrostatic pressure--order disorder transitions--single crystals--thermodynamics--elpasolites--landau theory--perovskite
Аннотация: Many compounds with general chemical formula A2BB?X6 and with tolerance factor value t < 1 crystallize in the elpasolite (ordered perovskite) structure. Different preparative methods have been considered. For example, the Bridgman technique is the most suitable method of growing single crystals of halogenated elpasolites with monoatomic cations. Group-theory and symmetry analyses have allowed us to build a scheme of possible structural distortions connected with octahedral rotations and displacements of ions. Experimental observations have proven that ferroelastic phase transitions occurring most frequently in elpasolites are due to small octahedra tilts. Quantitative analysis allows the possibility of describing these transitions in the framework of the thermodynamic Landau theory. Hydrostatic pressure and the substitution of atoms in different crystallographic sites allow to change significantly the succession and the temperature of phase transitions. The hypothesis of bond stresses is able to predict the possible occurrence of a phase transition for a particular elpasolite and/or the role of the octahedra rotations in the transformation. The mechanism of phase transitions in elpasolites and related compounds has also been considered. One can assume that a displacive mechanism associated with a strong anharmonicity plays a large role in phase transitions occurring in compounds with monoatomic cations. On the other hand, for instance, in cryolites with ammonium cations, the transitions originate from an order-disorder phenomenon. В© 1998 Elsevier Science S.A. All rights reserved.
Scopus
Найти похожие

20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zaitsev A. I., Zamkov A. V., Molokeev M. S., Cherepakhin A. V., Koroleva N. S.
Заглавие : Phase formation upon crystallization of SrO center dot 2B(2)O(3) glasses
Место публикации : Crystallogr. Rep. - NEW YORK: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 56, Is. 1. - С. 44-51. - JAN. - ISSN 1063-7745, DOI 10.1134/S1063774511010263
Примечания : Cited Reference Count: 21
Предметные рубрики: STRONTIUM TETRABORATE
LUMINESCENCE
SRB4O7
GROWTH
Ключевые слова (''Своб.индексиров.''): crystalline form--crystalline formation--crystalline phasis--glass surfaces--phase formations--thermal analysis--thermal stability--crystalline materials--crystallization--glass--thermoanalysis--thermodynamic stability--metastable phases
Аннотация: The crystallization of SrO center dot 2B(2)O(3) glasses has been studied. Four different crystalline formations were found to form simultaneously and independently on the glass surface: stable alpha-SrB4O7 crystals and metastable crystalline forms (beta-SrB4O7, Sr4B14O25, and spherulites (presumably, mixtures of crystalline phases)). The ranges of thermal stability of the newly formed metastable phases have been established using thermal analysis.
WOS,
Scopus,
eLibrary
Найти похожие