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Phase transition in the layered perovskite CsScF4 induced by hydrostatic pressure / 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 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SPECTRUM
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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Публикация на русском языке Фазовый переход в слоистом перовските CsScF[4], индуцированный гидростатическим давлением [Текст] / К. С. Александров [и др.] // Физ. тверд. тела. - Санкт-Петербург, 1999. - Т. 41 Вып. 9. - С. 1683-1685

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
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Pressure-induced phase transitions in ScF3 crystal-Raman spectra and lattice dynamics / K. S. Aleksandrov [et al.] // 7th Russian-CIS-Baltic-Japanese Symposium on Ferroelectricity (RCBJSF-7) : book of abstacts. - 2002. - P. 18
Кл.слова (ненормированные):
ScF3 -- high pressure -- phase transitions -- Raman scattering -- ab initio lattice dynamics
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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Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Voronov, V. N.; Воронов, Владимир Николаевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Goryainov, S. V.; Горяйнов, Сергей Владимирович; 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)
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Lattice dynamics and hydrostatic-pressure-induced phase transitions in ScF3 / 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 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
RAMAN-SPECTROSCOPY
CRYSTALS
SCATTERING
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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Публикация на русском языке Динамика решетки и индуцированные гидростатическим давлением фазовые переходы в ScF[3] [Текст] / К. С. Александров [и др.] // Журн. эксперим. и теор. физ. - 2002. - Т. 121 Вып. 5. - С. 1139-1148

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
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Pressure-induced phase transitions in ScF3 crystal-Raman spectra and lattice dynamics / K. S. Aleksandrov [et al.] // Ferroelectrics. - 2003. - Vol. 284. - P. 205-219, DOI 10.1080/00150190390204691. - Cited References: 24 . - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SCATTERING
Кл.слова (ненормированные):
ScF3 -- high pressure -- phase transitions -- Raman scattering -- ab initio lattice dynamics
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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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; Russian-CIS-Baltic-Japanese symposium on ferroelectricity(7 ; 2002 ; Jun ; 24-28 ; St.-Petersburg)
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Hydrostatic pressure-induced phase transitions in RbMnCl3: Raman spectra and lattice dynamics / A. N. Vtyurin [et al.] // Phys. Solid State. - 2004. - Vol. 46, Is. 7. - P. 1301-1310, DOI 10.1134/1.1778456. - Cited References: 16 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CRYSTALS
SPECTROSCOPY
Аннотация: Raman scattering spectra of RbMnCl3 are measured at room temperature under high hydrostatic pressure. The results are interpreted based on first principles lattice dynamics calculations. The experimental data obtained correlate with the calculations in the low frequency domain but disagree slightly in the region of high-frequency vibrations. The transition from the hexagonal to the cubic perovskite phase observed earlier (near 0.7 GPa) was confirmed, and new transitions to lower symmetry distorted phases were discovered (at 1.1 and 5 GPa). (C) 2004 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
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Jt. Inst. Geol., Geophys./Mineral., Siberian Division, Russian Academy of Sciences, pr. Nauki 3, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
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; Krylova, S. N.; Крылова, Светлана Николаевна; Shefer, A. D.
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Raman spectra and pressure-induced lattice instabilities in RbMnCl3 crystal / A. N. Vtyurin [et al.] // 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA) : WILEY-V C H VERLAG GMBH, 2004. - 11th International Conference on Phonon Scattering in Condensed Matter (PHONONS 2004) (JUL 25-30, 2004, St Petersburg, RUSSIA). - P. 3097-3100, DOI 10.1002/pssc.200405332. - Cited References: 14 . - ISBN 3-527-40588-7

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITION
SPECTROSCOPY
Кл.слова (ненормированные):
Frequencies -- Hydrostatic pressure -- Mathematical models -- Parameter estimation -- Raman scattering -- Spectrometers -- Stability -- Ambient conditions -- Anomalies -- Lattice instabilities -- Structural units -- Rubidium compounds
Аннотация: Raman scattering spectra of the RbMnCl3 crystal have been studied under ambient conditions and under high hydrostatic pressure. The results produced have been interpreted with the ab initio model. The experimental data agree well with the estimated values in the low frequency range and show a slightly worse agreement at higher frequencies. A phase transition from the hexagonal phase to the perovskite phase predicted earlier within the same model was observed under high pressure (above 0.7 GPa) and new transitions to lower symmetry phases were found at higher pressures (1.1 GPa and 5 GPa). (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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Держатели документа:
Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Inst. of Mineralogy and Petrography, 630090 Novosibirsk, Russian Federation

Доп.точки доступа:
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
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Raman spectra and higt pressure phase transitions in RbMnCl3 crystal / K. S. Aleksandrov [и др.] // Abstracts of the 8-th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity. - 2006. - P. 31

Материалы симпозиума

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)
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Raman spectroscopic study of the phase transitions induced by hydrostatic pressure in a Rb2KScF6 crystal / A. N. Vtyurin [et al.] // Phys. Solid State. - 2006. - Vol. 48: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA), Is. 6. - P. 1070-1072, DOI 10.1134/S1063783406060163. - Cited References: 4 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The Raman spectra of Rb2KScF6 elpasolite crystals are studied in the pressure range up to 7 GPa. A phase transition is revealed at a pressure of approximately I GPa. Analysis of the changes in the spectral parameters shows that the phase transition is accompanied by a doubling of the volume of the primitive cell in the initial cubic phase. Judging from the character of the variations in the pressure dependences of the frequency of the observed vibrations, there can exist another transition to the phase with a lower symmetry at a pressure of approximately 2.1 GPa.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Vtyurin, A. N.; Втюрин, Александр Николаевич; Krylov, A. S.; Крылов, Александр Сергеевич; Goryainov, S. V.; Krylova, S. N.; Крылова, Светлана Николаевна; Voronov, V. N.; Воронов, Владимир Николаевич
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Raman spectroscopic study of the phase transitions in the Cs2NH4WO3F3 oxyfluoride / A. S. Krylov [et al.] // Phys. Solid State. - 2006. - Vol. 48: 17th All-Russia Conference on the Physics of Ferroelectrics (VKS-XVII) (JUN 26-JUL 01, 2005, Penza, RUSSIA), Is. 6. - P. 1064-1066, DOI 10.1134/S106378340606014X. - Cited References: 5 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The Raman spectra of Cs2NH4WO3F3 elpasolite crystals are studied in the temperature range 93373 K at pressures of up to 6.3 GPa. No indication of a phase transition is revealed from the Raman spectra as the temperature decreases to 93 K. An analysis of the Raman spectra measured under pressure demonstrates that the Cs2NH4WO3F3 elpasolite crystals undergo a phase transition at a pressure of 2.58 GPa. Judging from the behavior of the pressure dependences of the vibrational frequencies, the revealed phase transition is associated with the lowering of the symmetry of the WO3F3 octahedra.

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Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Mineral & Petrog, Siberian Div, Novosibirsk 630090, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Mineralogy and Petrography, Siberian Division, Russian Academy of Sciences, Universitetskii pr. 3, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Vtyurin, A. N.; Втюрин, Александр Николаевич; Fokina, V. D.; Фокина, Валентина Дмитриевна; Goryainov, S. V.; Kocharova, A. G.; Кочарова, Алла Георгиевна
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10.

Vibrational spectroscopy study of phase transition in K3WO3F3: temperature and high pressure investigations [Text] / Ekimov A.A.Krylov A.S. [et al.] // Advanced inorganic fluorides : the Third International Siberian workshop Intersibfluorine - 2008, September 01-06, 2008, Vladivostok, Russia : proceedings of ISIF-2008. - Vladivostok, 2008. - p. 188 . - ISBN 978-5-98128-036-8

Доп.точки доступа:
Ekimov, A. A.; Krylov, A. S.; Крылов, Александр, Сергеевич; Vtyurin, A. N.; Ivanenko, A. A.; Иваненко, Александр, Анатольевич; Shestakov, N. P.; Шестаков, Николай, Петрович; Goryainov, S. V.; Kocharova, A. G.; Кочарова, Алла, Георгиевна; "Advanced inorganic fluorides", International Siberian workshop(3 ; 2008 ; SEP. ; Vladivostok)
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