Труды сотрудников института физики

/ S. V. Goryainov, A. S. Krylov, A. N. Vtyurin // Bull. Russ. Acad. Sci.: Phys. - 2013. - Vol. 77, Is. 3. - P. 313-316DOI 10.3103/S106287381303012X . -
Аннотация: The hysteresises (~0.3–0.4 GPa) of two transitions in natrolite at 0.9 and 1.45 GPa, considerable changes in the Raman spectra, and the appearance of very intense low–frequency mode at 75 cm–1 in the overhydrated phase of high pressure of water medium up to 6.2 GPa are observed for the first time. The depen dences of the band frequencies of this phase are nonlinear, due clearly to changes in the positions of H2 O in the channels. According to Raman data, fluorapatite placed together with natrolite in a water medium in a diamond anvil cell exhibits no transitions up to 6.2 GPa and displays linear pressure dependences of the band frequencies.

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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич

/ A. S. Krylov [и др.] // Proc. Joint Int. Symp: 11th Int. Symp. on Ferroic Domains and Micro-to Nanoscopic Structures and 11th - Russia/CIS/Baltic/Japan Symp. on Ferroelectricity. - 2012. - P207


Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Voronov, V. N.; Воронов, Владимир Николаевич; Объединенный международный симпозиум ISFD-11th-RCBJSF (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Международный симпозиум по доменам в ферроиках, микро- и нано-масштабным структурам (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Russian-CIS-Baltic-Japan Symposium on Ferroelectricity (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Российско-Японский и стран Балтии и СНГ симпозиум по сегнетоэлектричеству (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина

/ A. S. Oreshonkov [et al.] // Proc. Joint Int. Symp: 11th Int. Symp. on Ferroic Domains and Micro-to Nanoscopic Structures and 11th - Russia/CIS/Baltic/Japan Symp. on Ferroelectricity. - 2012. - P. 207


Доп.точки доступа:
Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Goryainov, S. V.; Voronov, V. N.; Воронов, Владимир Николаевич; Объединенный международный симпозиум ISFD-11th-RCBJSF (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Международный симпозиум по доменам в ферроиках, микро- и нано-масштабным структурам (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Russian-CIS-Baltic-Japan Symposium on Ferroelectricity (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Российско-Японский и стран Балтии и СНГ симпозиум по сегнетоэлектричеству (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина

/ A. N. Vtyurin [et al.] // Proc. Joint Int. Symp: 11th Int. Symp. on Ferroic Domains and Micro-to Nanoscopic Structures and 11th - Russia/CIS/Baltic/Japan Symp. on Ferroelectricity. - 2012. - P. 55


Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Объединенный международный симпозиум ISFD-11th-RCBJSF (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Международный симпозиум по доменам в ферроиках, микро- и нано-масштабным структурам (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Russian-CIS-Baltic-Japan Symposium on Ferroelectricity (11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg); Российско-Японский и стран Балтии и СНГ симпозиум по сегнетоэлектричеству (11 ; 2012 ; авг. ; 20-24 ; Екатеринбург); Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина

/ S. V. Goryainov [et al.] // J. Raman Spectrosc. - 2012. - Vol. 43, Is. 3. - P. 439-447, DOI 10.1002/jrs.3049. - Cited References: 18. - This work was supported by the Siberian Division of RAS (Integration Project 109), the Russian Ministry of Science and Education and the CRDF (BRHE - REC-008 grant) and the Russian Foundation for Basic Research (RFBR-11-05-01121). . - ISSN 0377-0486РУБ Spectroscopy

Аннотация: Layer silicates F- and OH-apophyllites, KCa4Si8O20(F, OH)·8H2O, have been investigated by Raman spectroscopy at hydrostatic and nonhydrostatic pressures up to 8 GPa in diamond anvil cells using a 4 : 1 methanol–ethanol mix as pressure-transmitting medium. Our experiments show that at hydrostatic compression, apophyllites retain their crystalline states (i.e. no amorphization) up to 5 GPa. The wavenumbers of most bands exhibit linear dependences on pressure, except for a few ones, e.g. at 162 and 3565 cm–1 in OH-form (160.5 and 3558 cm–1 in F-form) that show nonlinear dependences. Nonhydrostatic compression with additional uniaxial loading induces amorphization of apophyllites. The majority of the bands in OH-apophyllite decreases markedly in intensity and shows considerable broadening under nonhydrostatic compression up to 3–6 GPa. In addition, the wavenumbers of several bands at nonhydrostatic compression exhibit considerable nonlinear dependences on pressure with strong hysteresis. These bands are mainly associated with vibrations of the interlayer ions and molecules and also of stretching and bending silicate sheets, hence being highly sensitive to the interlayer distance. Finally, we have calculated the lattice dynamics of F-apophyllite and interpreted the majority of bands, and these data are used to explain the complex baric behavior of the bands. Copyright © 2011 John Wiley & Sons, Ltd.

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Держатели документа:
[Goryainov, Sergei V.
Madyukov, Iliya A.] SB RAS, Inst Geol & Mineral, Novosibirsk 630090, Russia
[Goryainov, Sergei V.
Pan, Yuanming] Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5E2, Canada
[Goryainov, Sergei V.] Novosibirsk State Univ, Novosibirsk 630090, Russia
[Krylov, Alexander S.
Vtyurin, Alexander N.] SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Smirnov, Mikhail B.] St Petersburg State Univ, Fac Phys, St Petersburg 198504, Russia

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Pan, Y. M.; Madyukov, I. A.; Smirnov, M. B.; Vtyurin, A. N.; Втюрин, Александр Николаевич

/ S. V. Goryainov [et al.] // Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P. 804-807, DOI 10.3103/S1062873812070143. - Cited References: 7 . - ISSN 1062-8738
Аннотация: The intermediate phases preceding overhydration are observed by Raman spectroscopy both in scolecite Ca[Al2Si3O10] • 3H2O and in thomsonite NaCa2[Al5Si 5O20] • 6H2O upon compression in an aque-ous medium. The first intermediate phase of scolecite is attributed to a phase precursor revealed earlier using XRD at pressure of ~1 GPa. The widening of the Raman bands of O-H vibrations caused by the disordering of H 2O, which appears after additional water molecules are embedded in the zeolite channels, is typical of this intermediate phase. It is assumed on the basis of the Raman spectroscopy data that scolecite contains sec-ond overhydrated and second intermediate phases. В© 2012 Allerton Press, Inc.

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Держатели документа:
Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Novosibirsk State University, Novosibirsk, 630090, Russian Federation
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Likhacheva, A.Yu.; Vtyurin, A. N.; Втюрин, Александр Николаевич

/ A. S. Krylov [et al.] // Cryst. Growth Des. - 2014. - Vol. 14, Is. 1. - P. 374-380, DOI 10.1021/cg400899m. - Cited References: 27. - This work was partly supported by the Russian Foundation for the Basic Research project no. 12-02-00056, no. 13-02-00825, and integration project SB RAS no. 28, SS-4828.2012.2. - Published as part of the Crystal Growth & Design virtual special issue Anion-controlled New Inorganic Materials. . - ISSN 1528-7483. - ISSN 1528-7505РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary

Аннотация: Phase transitions of the (NH4)2WO2F 4 crystal were studied by Raman spectroscopy in the range from 10 to 350 K. The mechanism of two phase transitions at T1 = 201 and T 2 = 160 K was proposed. The significant spectra changes occur in the range corresponding to the W-O vibrations. The first temperature phase transition is due to the ordering of the quasi-octahedral groups [WO 2F4]2- and partial ordering of ammonium groups. Experimental data allow for attributing the first (T1 = 201 K) phase transition to the first order close to the tricritical point. The noticeable changes of the Raman spectrum have been found in the range corresponding to the ammonium vibrations below the temperature T2. The second phase transition is associated with the further ordering of ammonium groups. Room temperature (296 K) experiments have been carried out under high hydrostatic pressure up to 10 GPa. Above 2 GPa, new spectral features appear, allowing for the assumption of the existence of a new high-pressure phase of (NH 4)2WO2F4, which is mainly connected with ordering of the [WO2F4]2- quasi-octahedral groups.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia
Inst Chem FEB RAS, Vladivostok 690022, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Laptash, N. M.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Krylova, S. N.; Крылова, Светлана Николаевна

/ A. S. Krylov [et al.] // J. Raman Spectrosc. - 2012. - Vol. 43, Is. 4. - P. 577-582, DOI 10.1002/jrs.3071. - Cited References: 24. - This work was partly supported by integration project SB RAS No 101, Russian Foundation for Basic Research project No 11-02-98002-r_siberia, No 09-02-00062, SS-4645.2010.2. . - ISSN 0377-0486РУБ Spectroscopy

Аннотация: Raman spectra of Rb2KTiOF5 crystal were obtained and analyzed in the temperature range from 77 to 297 K and under hydrostatic pressure up to 4.2 GPa (at T = 295 K). The experimental results were compared with quantum-chemical simulation of TiOF5 pseudo-octahedron. To interpret effects of lattice ordering, phonon spectra of several ordered phases of Rb2KTiOF5 were calculated within ab initio generalized Gordon–Kim model, and ordering of TiOF5 molecular groups were simulated within Monte Carlo approach. The spectra exhibited orientation disordering in the cubic phase under ambient conditions. Cooling below the phase transition temperature (215 K) leads to partial ordering of the structure. The isotropic perovskite-like phase was found to undergo first-order transition into a low-symmetry anisotropic phase at about 1 GPa. Further compression up to 4.1 GPa did not show any effects associated with phase transitions. Copyright © 2011 John Wiley & Sons, Ltd.

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Держатели документа:
[Krylov, A. S.
Vtyurin, A. N.
Krylova, S. N.
Sofronova, S. N.
Voronov, V. N.
Babushkin, S. V.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Goryainov, S. V.] Inst Mineral & Petrogaphy, Novosibirsk 630090, Russia
[Laptash, N. M.
Emelina, T. B.] Russian Acad Sci, Inst Chem, Vladivostok 690022, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylova, S. N.; Крылова, Светлана Николаевна; Sofronova, S. N.; Софронова, Светлана Николаевна; Laptash, N. M.; Emelina, T. B.; Voronov, V. N.; Воронов, Владимир Николаевич; Babushkin, S. V.

/ A. Y. Likhacheva [et al.] // J. Raman Spectrosc. - 2012. - Vol. 43, Is. 4. - P. 559-563, DOI 10.1002/jrs.3060. - Cited References: 38. - We greatly appreciate the critical comments of Prof. R. Kaindl and an anonymous reviewer on this work, and we thank Dr G. Lepezin for providing the cordierite sample. This work was supported by RFBR grant 11-05-01121-a. . - ISSN 0377-0486РУБ Spectroscopy

Аннотация: The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5 GPa. However, the distortion of the ring tetrahedra observed previously at 2.3 GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7 GPa in a diamond anvil cell. At P > 4 GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O–H stretching modes at about 4.5 GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P < 3 GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high-pressure phase is likely a consequence of distortion of the channel-forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd.

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Держатели документа:
[Likhacheva, Anna Yu.
Goryainov, Sergey V.
Bul'bak, Taras A.] RAS, SB, Sobolev Inst Geol Mineral, Novosibirsk 630090 90, Russia
[Krylov, Aleksandr S.] RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Prasad, Pinnelli S. R.] Natl Geophys Res Inst, Council Sci & Ind Res, Hyderabad 500007, Andhra Pradesh, India

Доп.точки доступа:
Likhacheva, A. Y.; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Bul'bak, T. A.; Prasad, PSR

/ A. N. Vtyurin [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 5. - P. 934-936, DOI 10.1134/S1063783412050472. - Cited References: 16. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir' and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no. 101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2). . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: The Raman spectra of the elpasolite (Rb2KInF6) crystal have been studied in the pressure range from 0 to 5.3 GPa at a temperature of 295 K. A phase transition at a pressure of approximately 0.9 GPa has been found. An analysis of the variations in the spectral parameters has led to the conclusion that the phase transition to a distorted phase is accompanied by the doubling of the volume of the primitive cell of the initial cubic phase. Numerical calculations of the lattice dynamics in the Rb2KInF6 crystal have been performed. The numerical simulation has established that the phase transition at a pressure of 0.9 GPa is associated with condensation of the F (lg) mode. A probable high-pressure phase is the phase with space group C2/m.

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Держатели документа:
[Vtyurin, A. N.
Krylov, A. S.
Krylova, S. N.
Oreshonkov, A. S.
Voronov, V. N.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Goryainov, S. V.] Russian Acad Sci, Siberian Branch, Inst Mineral & Petrog, Novosibirsk 630090, Russia

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Горяйнов, Сергей Владимирович; Krylova, S. N.; Крылова, Светлана Николаевна; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич

: Raman spectra and lattice dynamics simulations / A. N. Vtyurin [et al.] // Ferroelectrics. - 2012. - Vol. 440. - P. 100-104, DOI 10.1080/00150193.2012.743375. - Cited References: 10. - This work has been financially supported by grants: Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir' and 09-02-00062), the Siberian Branch of the Russian Academy of Sciences (integration project no. 101), and the Council on Grants from the President of the Russian Federation (grant no. HSh-4645.2010.2). . - ISSN 0015-0193
Аннотация: Raman scattering spectra of Rb2KInF6 and Rb2KScF6 crystals have been studied under hydrostatic pressure up to 5.3 GPa at room temperature. Results are interpreted within semiempirical simulations of the lattice dynamics. Observed phase transitions both in Rb2KInF6 and Rb2KScF6 crystals are associated with condensation of soft F-1g phonon mode. High-pressure phases for both crystals are supposed to be of C2/m space group.

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Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Goryainov, S. V.; Voronov, V. N.; Воронов, Владимир Николаевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures(11 ; 2012 ; Ekaterinburg); Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(11 ; 2012 ; Aug. ; 20-24 ; Ekaterinburg)

/ A. S. Krylov [et al.] // J. Solid State Chem. - 2014. - Vol. 218. - P. 32-37, DOI 10.1016/j.jssc.2014.05.028. - Cited References: 21. - The Authors are grateful to Prof. Zinenko V.I. for constructive discussion of the results. The work has been done with financial support of the Russian Foundation for Basic Research projects nos. 4828.2012.2, 12-02-31205; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" project no. 8379. . - ISSN 0022-4596. - ISSN 1095-726XРУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical

Аннотация: The results of structural phase transitions mechanisms study in K3WO3F3oxyfluoride are represented by different experimental and theoretical methods. The structural phase transition anomalies at T1=452 K and T2=414 K of Raman and IR spectra have been analyzed. Using vibrational spectroscopy methods, the NMR-experiment has been done to clarify the nature of found phase transitions: displacive types or order-disorder types. The model of “disordered” crystal was proposed, and the results of lattice dynamics calculation in frameworks of the generalized Gordon–Kim method of ordered (R3) and “disordered” crystals were compared. The high pressure phases were studied by the Raman technique too.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Kolesnikova, E. M.; Колесникова, Евгения Михайловна; Ivanov, Y. N.; Иванов, Юрий Николаевич; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Goryainov, S. V.; Ivanenko, A. A.; Иваненко, Александр Анатольевич; Shestakov, N. P.; Шестаков, Николай Петрович; Kocharova, A. G.; Кочарова, Алла Георгиевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [4828.2012.2, 12-02-31205]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]

/ А. С. Крылов, A. N. Vtyurin, S. V. Goryainov // Proc. of XXIV Int. Conf. on Raman Spectroscopy . - 2014. - P. 732-733
   Перевод заглавия: Роль теоретико-группового анализа в изучении фазовых переходов в кристаллах, индуцированных гидростатическим давлением
Аннотация: The work is devoted to understanding the role of the group-theoretical approach for the experimental studies of structural phase transitions induced by hydrostatic pressure. Perovskite-like crystals exhibit a variety of physical phenomena which are important for developing fundamental aspects of solid-state chemistry, physics and material science. The investigation of the pressure dependence of Raman spectra makes a significant contribution into understanding the nature of phase transitions. Some cases where the determination of new crystal structure and characteristic of phase transition has been assisted by group-theoretical analysis are considered. This approach is required at different steps of investigating the phase transitions. The first step is to find Raman rules in a primary phase, the second is to analyze and interpret the spectra obtained, the third is to theoretically simulate spectra in new phases and the fourth one is to compare the simulated and experimental spectra.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Крылов, Александр Сергеевич; International Conference on Raman Spectroscopy (24 ; 2014 ; авг. ; 10-15 ; Jena, Germany)

/ K. S. Aleksandrov [et al.] // Ferroelectrics. - 2003. - Vol. 284. - P. 205-219, DOI 10.1080/00150190390204691. - Cited References: 24 . - ISSN 0015-0193РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Аннотация: New pressure-induced phases are found in normally cubic ScF3 crystal using polarizing microscopy and micro-Raman spectroscopy. Their supposed space groups are R (3) over barc, Z = 2 and Pnma, Z = 4. Using ab initio model cubic phase was shown to be stable at ambient pressure down to T = 0 K, while hydrostatic pressure brings one of the phonon branches down to negative squared frequencies. R-5 soft mode condensation results in the rhombohedric distortion of the cubic lattice with cell volume doubling. Calculated squared frequencies of the high pressure phase are positive, their number and values agree with experimental results.

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Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Krylov, A. S.; Крылов, Александр Сергеевич; Russian-CIS-Baltic-Japanese symposium on ferroelectricity(7 ; 2002 ; Jun ; 24-28 ; St.-Petersburg)

/ K. S. Aleksandrov [et al.] // J. Exp. Theor. Phys. - 2002. - Vol. 94, Is. 5. - P. 977-984, DOI 10.1134/1.1484991. - Cited References: 20 . - ISSN 1063-7761РУБ Physics, Multidisciplinary

Аннотация: New phase transitions induced by hydrostatic pressure in a cubic (under standard conditions) ScF3 crystal are discovered by the methods of polarization microscopy and Raman scattering. The space groups R (3) over barc for Z = 2 and Pnma for Z = 4 are proposed for the high-pressure phases. A nonempirical computation of the lattice dynamics of the crystal is carried out. It is shown that, under normal pressure, the cubic phase is stable down to T = 0 K, while the application of a hydrostatic pressure gives rise to a phonon branch in the vibrational spectrum (between points R and M of the Brillouin zone) with negative values of squares of frequencies. The condensation of soft mode R-5 at the boundary point of the Brillouin zone leads to rhombohedral distortion of the cubic structure with the unit cell volume doubling. The calculated frequencies at q = 0 of the ScF3 lattice in the distorted rhombohedral phase are real-valued; the number and position of frequencies active in Raman scattering are in accord with the experimental values. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Joint Inst Geol Geophys & Mineral, Siberian Div, Novosibirsk 630090, Russia

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Krylov, A. S.; Крылов, Александр Сергеевич

/ K. S. Aleksandrov [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 9. - P. 1541-1543, DOI 10.1134/1.1131019. - Cited References: 9 . - ISSN 1063-7834РУБ Physics, Condensed Matter

Аннотация: Using polarization microscopy and Raman scattering, we have discovered a new phase transition in the layered perovskite crystal CsScF4 under a hydrostatic pressure around 6 GPa. The proposed space group of the high-pressure phase is C-2h(2), Z=4. (C) 1999 American Institute of Physics. [S1063-7834(99)03109-3].

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Unified Inst Geol Geophys & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Shmygol', I. V.; Шмыголь И. В.; Goryainov, S. V.; Горяйнов, Сергей Владимирович

/ K. S. Aleksandrov [et al.] // Phys. Solid State. - 2009. - Vol. 51, Is. 4. - P. 810-816, DOI 10.1134/S1063783409040295. - Cited References: 22. - The authors are grateful to V.I. Zinenko for helpful discussion of the results.This work was conducted in the framework of Integration Project (no. 3.7) of the Russian Academy of Sciences (Siberian Branch). . - ISSN 1063-7834
Аннотация: Pressure-induced phase transitions in the ScF3 crystal were studied using synchrotron radiation diffraction, polarization microscopy, and Raman spectroscopy. The phase existing in the range 0.6-3.0 GPa is optically anisotropic; its structure is described by space group R (3) c (Z = 2), and the transition is due to rotation of ScF6 octahedra around a threefold axis. The pressure dependence of the structural parameters and angle of rotation are determined. The number of Raman spectral lines corresponds to that expected for this structure; above the phase transition point, a recovery of soft modes takes place. At a pressure of 3.0 GPa, a transition occurs to a new phase, which remains metastable as the pressure decreases. The results are interpreted using an ab initio method based on the Gordon-Kim approach.

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Держатели документа:
[Aleksandrov, K. S.
Voronov, V. N.
Vtyurin, A. N.
Krylov, A. S.
Molokeev, M. S.
Pavlovskii, M. S.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Goryainov, S. V.
Likhacheva, A. Yu.] Russian Acad Sci, Siberian Branch, Inst Geol & Mineral, Novosibirsk 630090, Russia
[Ancharov, A. I.] Russian Acad Sci, Siberian Branch, Inst Solid State Chem, Novosibirsk 630091, Russia
ИФ СО РАН

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Goryainov, S. V.; Likhacheva, A. Y.; Ancharov, A. I.; Russian Academy of Sciences (Siberian Branch)

/ K. S. Aleksandrov [et al.] // Physics of the Solid State. - 2011. - Vol. 53, Is. 3. - P. 564-569, DOI 10.1134/S1063783411030036 . - ISSN 1063-7834
Аннотация: The high-pressure phase of the ScF 3 crystal has been studied using synchrotron radiation diffraction and Raman scattering. This phase existing in the pressure range 0.6-3.2 GPa is optically anisotropic: its structure is described by space group R3?c, Z = 2, and the transition is associated with the rotation of ScF6 octahedra around the threefold axis. The pressure dependences of the lattice parameters and the rotation angle have been determined. The number of lines in the Raman spectrum corresponds to the expected number for this structure; the recovery of soft modes has been observed above the phase transition. В© 2011 Pleiades Publishing, Ltd.

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Держатели документа:
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 Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk 630128, Russian Federation

Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Goryainov, S. V.; Likhacheva, A. Y.; Ancharov, A. I.

/ S. V. Goryainov [et al.] // J. Raman Spectrosc. - 2015. - Vol. 46, Is. 1. - P. 177-181, DOI 10.1002/jrs.4614. - Cited References:30. - This work was partly supported by the Russian Foundation for BasicResearch (grants N 14-05-00616 and 13-05-00185) and the Ministry ofEducation and Science of the Russian Federation. . - ISSN 0377. - ISSN 1097-4555
   Перевод заглавия: Исследование датолита CaBSiO4(ОН) при одновременно высоком давлении и высокой температуре методом спектроскопии комбинационного светаРУБ Spectroscopy

Аннотация: Using an in situ method of Raman spectroscopy and resistance-heated diamond anvil cell, the system datolite CaBSiO4(OH) – water has been investigated at simultaneously high pressure and temperature (up to Р ~5 GPa and Т ~250 °С). Two polymorphic transitions have been observed: (1) pressure-induced phase transition or the feature in pressure dependence of Raman band wavenumbers at P = 2 GPа and constant T = 22 °С and (2) heating-induced phase transition at T ~90 °С and P ~5 GPа. The number of Raman bands is retained at the first transition but changed at the second transition. The first transition is mainly distinguished by the changes in the slopes of pressure dependence of Raman peaks at 2 GPa. The second transition is characterized by several strong changes: the wavenumber jumps of major bands, the merging of strong doublets at 378 and 391 cm−1 (values for ambient conditions), the splitting of the intermediate-intensity band at 292 cm−1, and the transformation of some low-wavenumber bands at 160–190 cm−1. No spectral and visual signs of overhydration and amorphization have been observed. No noticeable dissolution of datolite in the water medium occurred at 5 GPa and 250 °С after 3 h, which corresponds to typical conditions of the ‘cold’ zones of slab subduction. Copyright © 2014 John Wiley & Sons, Ltd.

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Держатели документа:
VS Sobolev Inst Geol & Mineral SB RAS, Novosibirsk 630090, Russia.
LV Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia.
Univ Saskatchewan, Dept Geol Sci, Saskatoon, SK S7N 5E2, Canada.

Доп.точки доступа:
Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Pan, Y.; Russian Foundation for Basic Research [N 14-05-00616, 13-05-00185]; Ministry of Education and Science of the Russian Federation

/ K. S. Aleksandrov [и др.] // Abstracts of the 8-th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity. - 2006. - P. 31

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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Shefer, A. D.; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zinenko, V. I.; Зиненко, Виктор Иванович; Russia/CIS/Baltic/Japan Symposium on Ferroelectricity(8 ; 2006 ; May ; 15-19 ; Tsukuba, Japan)