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/ M. P. Ivliev [и др.] // Phase Transit. - 2014. - Vol. 87, Is. 6. - P. 592-602, DOI 10.1080/01411594.2013.878026. - Cited References: 14. - This study was supported by the of the President of the Russian Federation for the Support of Leading Scientific Schools [Grant NSh-924.2014.2]. . - ISSN 0141-1594. - ISSN 1029-0338
   Перевод заглавия: "Псевдособственный" сегнетоэлектрический фазовый переход в оксифториде K3WO3F3
Аннотация: Based on the structural data on the phases of cryolite (ordered perovskite) K3WO3F3, we develop a statistical model, which allows to describe the sequence of phase transitions observed in this compound using a unified approach. According to the model, the crystal possesses two structural subsystems: the K cations located in the octahedral positions and the WO3F3 octahedra in positions alternating with K cations. In the symmetric (cubic) phase, each subsystem can be found in one of the eight states. At decreasing temperature, an orientational phase transition in the subsystem of octahedra occurs first, followed by a phase transition to the low-temperature phase, caused by the loss of stability with respect to the ordering in the K cation subsystem. We find that the electric polarization occurs as pseudoproper and discuss the mechanisms of formation of the phase states.

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Держатели документа:
Southern Fed Univ, Inst Phys Res, Rostov Na Donu, Russia
Siberian Fed Univ, Inst Phys Engn & Radioelect, Krasnoyarsk, Russia
Siberian Dept RAS, Kirensky Inst Phys, Krasnoyarsk, Russia

Доп.точки доступа:
Ivliev, M. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sakhnenko, V. P.

/ M. S. Molokeev, S. V. Misyul' // Phys. Solid State. - 2011. - Vol. 53, Is. 8. - P. 1672-1679, DOI 10.1134/S1063783411080208. - Cited References: 18. - This study was supported by the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4645.2010.2). . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: The structures of two phases of the (NH4)(2)KWO3F3 crystal have been determined from X-ray diffraction data obtained for a powder sample. The profile and structural parameters have been refined according to the procedure implemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic orderings and allows one to interpret the experimental data. It has been found that the symmetry transformation in the crystal can be schematically represented in the form Fm (3) over barm (10-10((X) over bar5)) - ((eta, 0, 0, 0, 0, 0)) Pmmn.This transformation is accompanied by the ordering of WO3F3 polyhedra and the displacement of NH4 and K ions.

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Держатели документа:
[Molokeev, M. S.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Misyul', S. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodnyi pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Misyul', S. V.; Мисюль, Сергей Валентинович; Молокеев, Максим Сергеевич

/ E. I. Pogorel'tsev [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 6. - P. 1202-1211, DOI 10.1134/S1063783411060266. - Cited References: 24. - This study was supported by the Siberian Branch of the Russian Academy of Sciences within the framework of the Interdisciplinary Integration project no. 34 SO RAN and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (project no. NSh-4645-2010.2). . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: According to the results of calorimetric and structural studies, the Fm (3) over barm phase in K(2)NaMoO(3)F(3) remains stable at least to 100 K. No ferroelectric transformation assumed earlier has been revealed in a series of Rb(2)KMoO(3)F(3) samples prepared using various technologies. Only a phase transition of nonferroelectric origin has been observed near 195 K, and its thermodynamic characteristics have been determined. An analysis of the stability of the cubic structure of molybdenum fluorine-oxygen elpasolites-cryolites has been performed in the framework of the hypothesis on strengths of interatomic bonds. The barocaloric effect in Rb(2)KMoO(3)F(3) has been estimated.

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Держатели документа:
[Pogorel'tsev, E. I.
Gorev, M. V.
Flerov, I. N.] Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia
[Bogdanov, E. V.
Molokeev, M. S.
Voronov, V. N.
Gorev, M. V.
Flerov, I. N.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Isaenko, L. I.
Zhurkov, S. A.] Russian Acad Sci, Siberian Branch, Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia
[Laptash, N. M.] Russian Acad Sci, Far Eastern Branch, Inst Chem, Vladivostok 690022, Russia
ИФ СО РАН
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk 660041, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk 630090, Russian Federation
Institute of Chemistry, Far Eastern Branch, Russian Academy of Sciences, ul. Stoletiya Vladivostoka 159, Vladivostok 690022, Russian Federation

Доп.точки доступа:
Pogorel'tsev, E. I.; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Isaenko, L. I.; Zhurkov, S. A.; Laptash, N. M.; Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич

/ A. N. Vtyurin [et al.] // Phys. Solid State. - 2011. - Vol. 53, Is. 4. - P. 840-844, DOI 10.1134/S1063783411040330. - Cited References: 7. - This study was supported by the Russian Foundation for Basic Research (project no. 08-02-00066-a). . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: Comparative investigations of infrared absorption spectra of ion-molecular crystals of the ammonium-containing oxyfluorides (NH(4))(3)WO(3)F(3) and (NH(4))(3)MoO(3)F(3) have been performed. It has been found that the parameters of the vibrational spectra exhibit anomalies in the ranges of internal vibrations of the MeO(3)F(3) octahedral groups and ammonium ions near the phase transition temperatures. A comparative analysis of the IR spectra allows us to affirm that the studied phase transition in (NH(4))(3)WO(3)F(3) is primarily associated with the ordering of octahedral groups, whereas in (NH(4))(3)MoO(3)F(3), it is mainly due to the ordering of ammonium groups and the distortion of ammonium ions by the crystal environment.

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Держатели документа:
[Vtyurin, A. N.
Gerasimova, Yu V.
Shestakov, N. P.
Ivanenko, A. A.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Shestakov, N. P.; Шестаков, Николай Петрович; Ivanenko, A. A.; Иваненко, Александр Анатольевич

/ I. N. Flerov [et al.] // Phys. Solid State. - 2007. - Vol. 49, Is. 6. - P. 1149-1156, DOI 10.1134/S1063783407060212. - Cited References: 11 . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: The thermal properties and structure of (ND4)(2)WO2F4 crystals are investigated. It is established that deuteration does not lead to a change in the symmetry of the initial phase Cmcm but considerably decreases the extent of its disordering, which, in turn, brings about a substantial decrease in the phase transition entropy. Apart from the anomalies associated with phase transitions characteristic of the protonic compound, the heat capacity exhibits two additional anomalies. Analysis of the phase diagram of the deuterated crystal reveals a triple point at a pressure p = 0.18 GPa, which is predicted for (NH4)(2)WO2F4 at about 0.7 GPa.

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

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Bogdanov, E. V.; Богданов, Евгений Витальевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Kocharova, A. G.; Кочарова, Алла Георгиевна

/ A. N. Vtyurin [et al.] ; ed. B Perrin [et al.] // 12TH INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN CONDENSED MATTER (PHONONS 2007). Ser. Journal of Physics Conference Series : IOP PUBLISHING LTD, 2007. - Vol. 92: 12th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 15-20, 2007, Paris, FRANCE). - Ст. 12158, DOI 10.1088/1742-6596/92/1/012158. - Cited References: 6 . - ISBN 1742-6588РУБ Physics, Condensed Matter

Аннотация: Raman spectra of perovskite-like (NH(4))(3)WO(3)F(3), (NH(4))(2)KWO(3)F(3) and Cs(2)(NH(4))WO(3)F(3) oxyfluorides are obtained in a wide temperature range including transition points. Transition anomalies are found and analyzed. Transformation in (NH(4))(3)WO(3)F(3) is shown to be bound with octahedron groups ordering and strong distortion of ammonium ions due to H-bond formation, that is accompanied by cell volume multiplication, hardening and formation of complex discrete low frequency lattice spectrum. Same cell doubling was found in (NH(4))(2)KWO(3)F(3), but without lattice ordering Cs(2)(NH(4))WO(3)F(3) lattice stays disordered down to 15 K.

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Держатели документа:
[Vtyurin, A. N.
Krylov, A. S.
Gerasimova, J. V.
Fokina, V. D.
Kocharova, A. G.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institute of Chemistry, 690022 Vladivostok, Russian Federation
Institute of Automation and Electrometry, 630090 Novosibirsk, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Gerasimova, J. V.; Герасимова, Юлия Валентиновна; Fokina, V. D.; Фокина, Валентина Дмитриевна; Kocharova, A. G.; Кочарова, Алла Георгиевна; Laptash, N. M.; Voyt, E. I.; Surovtsev, N. V.; Perrin, B. \ed.\; Bonello, B. \ed.\; Devos, A. \ed.\; Duquesne, JY. \ed.\; Duquesne,, Y. \ed.\

/ I. N. Flerov [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 8. - P. 1559-1567, DOI 10.1134/S1063783406080221. - Cited References: 18 . - ISSN 1063-7834РУБ Physics, Condensed Matter

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.

/ L. S. Smirnov [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 11. - P. 2362-2366, DOI 10.1134/S1063783409110262. - Cited References: 15. - This study was supported by the Russian Foundation for Basic Research (project no. 09-02-00062) and the ORNL/SNS controlled by UT-Battelle, LLC, the U.S. Department of Energy (contract DE-AC05-00OR22725); the experiments in the Argonne National Laboratory were supported by the Office of General Sciences on Energy, Division of Materials Science of the U.S. Department of Energy (contract DE-AC02-06CH11357). . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: Oxyfluoride (NH4)(2)WO2F4 has been studied by the inelastic neutron scattering method over a wide temperature range 10-300 K at two initial neutron energies of 15 and 60 meV. The role of tetrahedral ammonium groups in the mechanism of sequential phase transitions at T (1) = 201 K and T (2) = 160 K has been discussed.

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Держатели документа:
[Smirnov, L. S.] Alikhanov Inst Theoret & Expt Phys, Moscow 117218, Russia
[Kolesnikov, A. I.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA
[Flerov, I. N.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Flerov, I. N.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Laptash, N. M.] Russian Acad Sci, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia
ИФ СО РАН

Доп.точки доступа:
Smirnov, L. S.; Kolesnikov, A. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Laptash, N. M.; Russian Foundation [09-02-00062]; U.S. Department of Energy [DE-AC05-00OR22725, DE-AC02-06CH11357]

/ V. D. Fokina [et al.] // Solid State Sci. - 2009. - Vol. 11, Is. 4. - P. 836-840, DOI 10.1016/j.solidstatesciences.2008.11.004. - Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102). - Финансирующая организация: Russian Foundation for Basic Research [06-02-16102] . - ISSN 1293-2558
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.

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Держатели документа:
RAS, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia

Доп.точки доступа:
Fokina, V. D.; Фокина, Валентина Дмитриевна; Gorev, M. V.; Горев, Михаил Васильевич; Kocharova, A. G.; Кочарова, Алла Георгиевна; Flerov, I. N.; Флёров, Игорь Николаевич; Pogoreltsev, E.I.