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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Мисюль, Сергей Валентинович
Заглавие : Симметричный анализ решеточных колебаний и искаженные фазы в структуре эксполита A2BB'X6
Место публикации : Кристаллография. - 1984. - Т. 29, Вып. 5. - С. 941-944
Примечания : Библиогр.: 17 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Глякин, Виктор Петрович, Гукалова А. Г., Мисюль, Сергей Валентинович
Заглавие : Структура прафазы и рентгенографические исследования фазовых переходов в кристаллах In3Sb5O12
Место публикации : Кристаллография. - 1989. - Т. 34, Вып. 3. - С. 649-654
Примечания : Библиогр.: 17 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Александров, Кирилл Сергеевич, Круглик, Анатолий Иванович, Мисюль, Сергей Валентинович, Симонов М. А.
Заглавие : Структура кислого селената аммония при комнатной температуре
Место публикации : Кристаллография. - 1980. - Т. 25, Вып. 6. - С. 1142–1147
Примечания : Библиогр.: 7 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Александров, Кирилл Сергеевич, Мисюль, Сергей Валентинович
Заглавие : Фазовые переходы, связанные с ротационными искажениями структуры в кристаллах, родственных перовскиту
Место публикации : Кристаллография. - 1981. - Т. 26, Вып. 5. - С. 1074-1085
Примечания : Библиогр.: 40 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Raevski I. P., Molokeev M. S., Misyul S. V., Eremin E. V., Blazhevich A. V., Kubrin S. P., Sarychev D. A., Titov V. V., Chen H., Chou, C. -C., Raevskaya S. I., Malitskaya M. A.
Заглавие : Studies of ferroelectric and magnetic phase transitions in multiferroic PbFe0.5Ta0.5O3
Коллективы : International Conference of Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials , Russian Foundation for Basic Research (RFBR) [12-08-00887_a, 14-02-90438_Ucr_a], Ministry of education and science of Russian Federation [2132, 2014/174], Southern Federal University [213.01-2014/012-VG], Research Committee of the University of Macau under Research & Development Grant for Chair Professor
Место публикации : Ferroelectrics: Taylor & Francis, 2015. - Vol. 475, Is. 1: Special Issue: Proceedings of International Conference of Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials (PFM-2014) Part I of III. - P.52-60. - ISSN 0015, DOI 10.1080/00150193.2015.995009. - ISSN 15635112(eISSN)
Примечания : Cited References:26. - This study is partially supported by the Russian Foundation for Basic Research (RFBR) project (projects 12-08-00887_a and 14-02-90438_Ucr_a), Ministry of education and science of Russian Federation (research project 2132, task 2014/174), Southern Federal University grant 213.01-2014/012-VG and Research Committee of the University of Macau under Research & Development Grant for Chair Professor.
Предметные рубрики: NEUTRON POWDER DIFFRACTION
Pb(Fe1/2Ta1/2)O-3
Ключевые слова (''Своб.индексиров.''): lead iron tantalate--multiferroic--ferroelectric--lattice parameters--phase transition
Аннотация: X-ray, magnetic, and Mossbauer studies of a PbFe0.5Ta0.5O3 powder have been carried out. For the first time temperature dependence of the unit cell parameters was obtained. Antiferromagnetic Neel temperature T-N approximate to 180K was determined using the results of Mossbauer studies. In the vicinity of T-N an anomaly in the temperature dependence of the monoclinic angle beta was revealed in PFT. This anomaly seems to be due to the magnetoelectric coupling.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Flerov I. N., Melnikova S. V., Kruglik A. I., Misyul S. V., Ageev O. A.
Заглавие : Phase-transitions in layered perovskite like ferroelastics
Коллективы : International meeting on ferroelectricity
Место публикации : International meeting on ferroelectricity (7 ; 1989 ; 28 Aug.-1 Sept. ; Saarbrucken, Fed. Rep. Ger.). Ferroelectrics: GORDON BREACH SCI PUBL LTD, 1990. - Vol. 104, Is. 1. - P.285-297. - ISSN 0015-0193, DOI 10.1080/00150199008223830
Примечания : Cited References: 29
Аннотация: Phase transitions and structural distor-tions in two layered perovskite-like families of crystals are discussed. New data devoted to study of Rb4Cd3Cl10 and RbAlF4 are presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Molokeev M. S., Laptash N. M., Udovenko A. A., Pogoreltsev E. I., Mel'nikova S. V., Misyul S. V.
Заглавие : Structural transformation between two cubic phases of (NH4)3SnF7
Место публикации : J. Fluor. Chem.: Elsevier, 2015. - Vol. 178. - P.86-92. - ISSN 0022-1139, DOI 10.1016/j.jfluchem.2015.06.024
Примечания : Cited References: 19. - We thank T.A. Kaidalova for the idea of doubling the unit cell parameter of (NH4)3SnF7 at room temperature. The reported study was partially supported by RFBR, research project No. 15-02-02009 a.
Предметные рубрики: CRYSTAL-STRUCTURE
TRANSITION
NH4F
Ключевые слова (''Своб.индексиров.''): cubic fluorides--phase transitions--x-ray--calorimetry--crystal optics
Аннотация: Reinvestigations of the room temperature structure of ammonium heptafluorostannate (NH4)3SnF7 = (NH4)2SnF6·NH4F = (NH4)3[SnF6]F by both powder and single crystal X-ray diffractions have revealed that its real symmetry is Pa−3 (Z = 8) instead of Pm−3m (Z = 1) suggested earlier. Polarizing optical observations, heat capacity, X-ray powder, and single crystal measurements were performed in a wide temperature range (100–420 K). A reversible structural phase transition of the first order between two cubic modifications Pa−3 ↔ Pm−3m was found at about T0 = 360 K. The structural models associated with partially disordered and totally ordered high and low temperature phases, respectively, comply with a large value of phase transition entropy.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safonov I. N., Misyul' S. V., Molokeev M. S., Ivliev M. P.
Заглавие : Structural transformations and phenomenological description of the formation of phase states in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb)
Коллективы : Ministry of Education and Science of the Russian Federation [3.2534.2014/K]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 57, Is. 3. - P.491-498. - ISSN 1063, DOI 10.1134/S1063783415030282. - ISSN 10906460(eISSN)
Примечания : Cited References:20. - This study was supported by the Ministry of Education and Science of the Russian Federation within the framework of the State Task for the Russian Siberian Federal University for Implementation of Scientific Research Work in 2014 (assignment no. 3.2534.2014/K).
Предметные рубрики: TRANSITIONS
CRYSTALS
Аннотация: The structures of the cubic and monoclinic phases of an Rb2KHoF6 crystal from a series of elpasolites Rb2KB′F6 (B′ = Ho, Dy, Tb), which undergoes a trigger phase transition, have been investigated using X-ray powder diffraction. The critical and noncritical displacements of atoms in the Rb2KHoF6 structure have been determined from the group-theoretical analysis of the complete condensate of order parameters. It has been reliably established that a change in the symmetry due to the phase transition in this crystal can be represented in the form Fmˉ3m11−9(Γ+4)⊕10−3(X+3)(ϕ,ϕ,ψ)P121/n1Fm\bar 3m\frac{{11 - 9(\Gamma _4. + ) \oplus 10 - 3(X_3. + )}} {{(\phi ,\phi ,\psi )}}P12_1 /n1 . A phenomenological analysis of the conditions responsible for the formation of phase states upon the phase transitions in elpasolites Cs2RbDyF6 and Rb2KB′F6 (B′ = Ho, Dy, Tb) has been carried out. Taking into account the structural data and using the phenomenological theory, it has been found that the main factor determining the formation of phase states in these and related crystals is the instability of the elpasolite structure with respect to rotational distortions of two types. It has been shown that an important role in the formation of a sequence of structural transformations in these crystals is played by the interaction of rotational order parameters and displacements of the cation from the center of a cuboctahedral hole.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Molokeev M. S., Misyul S. V., Bondarev V. S., Velikanov D. A., Frontzek M., Schefer J.
Заглавие : Crystal and magnetic structures, phase transitions in quasi-one-dimensional pyroxenes Na0.5Li0.5FeGe2O6
Коллективы : Ministry of Education and Science of the Russian Federation of Siberian Federal University
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 385. - P.243-249. - ISSN 0304, DOI 10.1016/j.jmmm.2015.03.016. - ISSN 18734766(eISSN)
Примечания : Cited References:25. - Neutron beam time at the cold neutron powder diffractometer DMC at the Swiss spallation neutron source SINQ Paul Scherrer Institut, Switzerland is gratefully acknowledged. MF acknowledges funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement no. 290605 (PSIFELLOW/COFUND). This work was also supported by Ministry of Education and Science of the Russian Federation of Siberian Federal University 2014 year (Assignment no. 3.2534.2014/K).
Предметные рубрики: CLINOPYROXENE-TYPE LIFEGE2O6
NAFESI2O6
LIFESI2O6
Ключевые слова (''Своб.индексиров.''): phase transition--magnetic structure--pyroxene--magnetic properties--calorimetric measurements
Аннотация: The possibility of cation substitution in pyroxenes allows the investigation the gradual change of structural and magnetic properties under doping in these compounds. Here, Na0.5Li0.5FeGe2O6 was prepared by the standard solid-phase reaction method and has been investigated using X-ray and neutron powder diffraction, and further characterized by magnetic and calorimetric measurements. The crystal structure of Na0.5Li0.5FeGe2O6 at 300 K is monoclinic C2/c (a=10.0333(1), b=8.8136(1), c=5.5295(9) Å, β=108.921(1)°). Calorimetric investigations indicate a displacive first order phase transition at T=271±1 K which is accompanied by the appearance of superstructure reflections in the X-ray patterns. At this transition Na0.5Li0.5FeGe2O6 undergoes a space group change from C2/c to P21/c (a=9.9692(3), b=8.8545(3), c=5.4752(2) Å, β=108.494(1)°). Magnetic order has been found below the Néel temperature TN≈18 K and has been refined from neutron diffraction. The quasi-low-dimensional magnetic spin system Na0.5Li0.5FeGe2O6 exhibits a collinear antiferromagnetic structure with the space group Pa21/c and the doubling of the unit cell along the crystallographic a-axis of the pyroxene crystal (propagation vector k=(1/2, 0, 0)). The critical modes which are responsible for the phase transition from C2/c to P21/c symmetry and for the magnetic transition from paramagnetic to antiferromagnetic state have been determined and their role in the transition is described. They are also the relevant mechanism driving the magnetic order in LiFeGe2O6.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chechin G. M., Sakhnenko V. P., Misyul S. V., Aleksandrov K. S.
Заглавие : Improper ferroelectric phase due to condensation of two order parameters in crystals of high-temperature superconductors
Место публикации : Ferroelectrics. - 1992. - Vol. 130, Is. 1. - P.155-162. - ISSN 0015-0193
Примечания : Cited References: 21
Предметные рубрики: TRANSITIONS
FERROELASTICS
RB3CD2CL7
Ключевые слова (''Своб.индексиров.''): ceramic materials--crystals--ferroelectricity--phase diagrams--order parameters--oxide superconductors--high temperature superconductors
Аннотация: Using group-theoretical methods it is shown that improper ferroelectric phase may arise in high-temperature superconductors (HTSC) where high-symmetry phases have space groups D4h1 or D4h17. Their appearance is caused by condensation of order parameters (OP's) transforming two irreducible representations (IR's). The most typical phase diagrams are considered, as well as temperature dependence of OP's and the basic structural mechanism of the ferroelectricity arising in the HTSC.
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