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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mel'nikova S. V., Molokeev M. S., Laptash N. M., Misyul S. V.
Заглавие : A non-typical sequence of phase transitions in (NH4)3GeF7: optical and structural characterization
Коллективы : RFBR [15-02-02009 a]
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2016. - Vol. 45, Is. 12. - P.5321-5327. - ISSN 1477-9226, DOI 10.1039/c5dt04907e. - ISSN 1477-9234(eISSN)
Примечания : Cited References:25. - The reported study was partially supported by RFBR, research project no. 15-02-02009 a
Предметные рубрики: Crystal-structure
Powder diffraction
NH4F
Fluorination
Аннотация: Single crystals of germanium double salt (NH4)3GeF7 = (NH4)2GeF6·NH4F = (NH4)3[GeF6]F were grown and studied by the methods of polarization optics and X-ray diffraction. The birefringence Δn = (no − ne), the rotation angle of the optical indicatrix ϕ(T) and unit cell parameters were measured in the temperature range 100–400 K. Three structural phase transitions were found at the temperatures: T1↓ = 279.2 K (T1↑ = 279.4 K), T2↑ = 270 K (T2↓ = 268.9 K), T3↓ = 218 K (T3↑ = 227 K). An unusual sequence of symmetry transformations with temperature change was established: P4/mbm (Z = 2) (G1) ↔ Pbam (Z = 4) (G2) ↔ P21/c (Z = 4) (G3) ↔ Pa (Z = 8) (G4). The crystal structures of different phases were determined. The experimental data were additionally interpreted by a group-theoretical analysis of the complete condensate of order parameters taking into account the critical and noncritical atomic displacements. Strengthening of the N–H⋯F hydrogen bonds can be a driving force of the observed phase transitions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Сафонов И. Н., Севрюков Р. Г., Молокеев, Максим Сергеевич, Мисюль, Сергей Валентинович
Заглавие : Феноменологическое описание последовательности фазовых переходов в слоистом перовските CsScF4
Коллективы : "Упорядочение в минералах и сплавах", международный симпозиум, Российская академия наук, Южный федеральный университет, Институт радиотехники и электроники им. В.А. Котельникова РАН, Институт проблем комплексного освоения недр РАН, Институт металлургии и материаловедения им. А. А. Байкова РАН, Региональная общественная организация работников образования и науки , "Ordering in Minerals and Alloys", international meeting
Место публикации : XVIII Междунар. симп. «Упорядочение в минералах и сплавах» (ОМА-18): Труды симп. - Ростов н/Д, 2015. - С. 182-185. - ISBN 978-5-9907095-6-0
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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) : 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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Мисюль, Сергей Валентинович, Молокеев, Максим Сергеевич, Сафонов И. Н.
Заглавие : Рентгендифракционные исследования и термодинамическое описание фазовых переходов в эльпасолитах Rb2KHoF6 и Cs2RbDyF6
Коллективы : Всероссийская конференция по физике сегнетоэлектриков (20; 2014 ; 18-22 авг.; Красноярск)
Место публикации : XX Всероссийская конференция по физике сегнетоэлектриков. ВКС-XX. - Красноярск: ИФ СО РАН, 2014. - С. 65-66 (Шифр 667646)
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Молокеев, Максим Сергеевич, Флёров, Игорь Николаевич, Лапташ Н. М., Погорельцев, Евгений Ильич, Мисюль, Сергей Валентинович
Заглавие : Реконструктивный фазовый переход в (NH4)3TiF7
Место публикации : XX Всероссийская конференция по физике сегнетоэлектриков. ВКС-XX. - Красноярск: ИФ СО РАН, 2014. - С. 61-62 (Шифр 667646)
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ивлиев М. П., Мисюль, Сергей Валентинович, Молокеев, Максим Сергеевич, Сахненко В. П.
Заглавие : Механизмы формирования фазовых состояний в K3WO3F3
Коллективы : Всероссийская конференция по физике сегнетоэлектриков (20; 2014 ; 18-22 авг.; Красноярск)
Место публикации : XX Всероссийская конференция по физике сегнетоэлектриков. ВКС-XX. - Красноярск: ИФ СО РАН, 2014. - С. 89-90 (Шифр 667646)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Misjul S. V., Flerov I. N., Laptash N. M.
Заглавие : Reconstructive phase transition in (NH4)3TiF7 accompanied by the ordering of TiF6 octahedra
Место публикации : Acta Crystallogr. B: Wiley-Blackwell, 2014. - Vol. 70. - P.924-931. - ISSN 0108-7681, DOI 10.1107/S2052520614021192. - ISSN 1600-5740
Примечания : This study was supported by Russian Fund of Basic Research, project No. 12-02-00056 a
Предметные рубрики: CRYSTAL-STRUCTURE
NEUTRON-DIFFRACTION
POWDER DIFFRACTION
FLUORIDES
DISORDER
MECHANISM
PATHWAYS
COMPLEX
LI3THF7
ALPHA
Ключевые слова (''Своб.индексиров.''): reconstructive phase transition--ammonium heptafluorotitanate--order-disorder transition
Аннотация: An unusual phase transition P4/mnc →Pa3 has been detected after cooling the (NH4)3TiF7 compound. Some TiF6 octahedra, which are disordered in the room-temperature tetragonal structure, become ordered in the low-temperature cubic phase due to the disappearance of the fourfold axis. Other TiF6 octahedra undergo large rotations resulting in huge displacements of the F atoms by 1.5-1.8 Å that implies a reconstructive phase transition. It was supposed that phases P4/mbm and Pm3m could be a high-temperature phase and a parent phase, respectively, in (NH4)3TiF7. Therefore, the sequence of phase transitions can be written as Pm3m → P4/bm → P4/mnc → Pa3. The interrelation between (NH4)3TiF7, (NH4)3GeF7 and (NH4)3PbF7 is found, which allows us to suppose phase transitions in relative compounds.
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