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Raman spectroscopic study of the lattice dynamics in the Rb2KMoO3F3 oxyfluoride / A. S. Krylov [et al.] // Phys. Solid State. - 2012. - Vol. 54, Is. 6. - P. 1275-1280, DOI 10.1134/S1063783412060170. - Cited References: 24. - This study was supported by the Russian Foundation for Basic Research (project nos. 11-02-98002-r_sibir', 09-02-00062, and NSh-4645.2010.2). . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
PHASE-TRANSITIONS
   SCATTERING
   (NH4)3WO3F3
   CRYSTALS
   DISORDER
   Cs
Аннотация: The lattice dynamics of the Rb2KMoO3F3 oxyfluoride has been studied by Raman spectroscopy in the temperature range 7–400 K. A phase transition has been revealed at T ≈ 185 K with decreasing temperature. Anomalies of the frequencies and Raman line half-widths have been analyzed. No condensation of soft lattice modes has been found. The character of changes in the Raman spectra of the Rb2KMoO3F3 oxyfluoride shows that the phase transition is related to variations in the [MoO3F3]3− molecular octahedron.

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Публикация на русском языке Исследование динамики решетки оксифторида Rb2KMoO3F3 методом комбинационного рассеяния света [Текст] / А. С. Крылов [и др.] // Физ. тверд. тела : Физико-технический институт им. А.Ф.Иоффе РАН, 2012. - Т. 54 Вып. 6. - С. 1191-1196

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Merkushova, E. M.; Меркушова, Евгения Михайловна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Isaenko, L. I.; Исаенко Л.И.
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Raman scattering study of temperature phase transitions in (NH4)3MoO3F3 / A. S. Krylov [et al.] // Ferroelectrics. - 2012. - Vol. 430. - P. 65-70, DOI 10.1080/00150193.2012.677694. - Cited References: 16. - Authors wish to thank prof. I. N. Flerov for their valuable support and useful discussions. This work has been financially supported by grants RFFBR 09-02-00062, 11-02-98002-r_sibir, SS - 4645.2010.2. . - 6. - ISSN 0015-0193

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
OXYFLUORIDE
(NH4)3WO3F3
Кл.слова (ненормированные):
(NH4)(3)MoO3F3 -- temperature phase transitions -- Raman scattering
Аннотация: Raman scattering spectra of (NH4)3MoO3F3 crystal have been studied in temperature range from 77 to 377 K. Parameters of Raman lines have been quantitatively analyzed. Transitional anomalies were found in the internal modes octahedral groups MоO3F3 and ammonium groups at 297 K. The ferroelectric phase transition (297 K) in (NH4)3MoO3F3 is associated with the partly ordering of octahedral MоO3F3 and the ammonium cations. The ferroelastic phase transition (205 K) is associated with the further ordering of octahedral MоO3F3.

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Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Laptash, N. M.; Kocharova, A. G.; Кочарова, Алла Георгиевна; European Meeting on Ferroelectricity(12 ; 2011 ; 26 June - 1 July ; Bordeaux, France)
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Measurement of Raman-scattering spectra of Rb2KMoO3F3 crystal: Evidence for controllable disorder in the lattice structure / A. S. Krylov [et al.] // Cryst. Growth Des. - 2014. - Vol. 14, Is. 3. - P. 923-927, DOI 10.1021/cg4008894. - Cited References: 31. - The authors are grateful to Prof. I. N. Flerov for valuable support and useful discussions. The authors acknowledge stimulating discussions with Dr. S. N. Sofronova and Dr. A. S. Aleksandrovsky. The assistance of Dr. S. Skokov is sincerely appreciated. This work was partly supported by Russian Foundation for Basic Research project nos. 11-02-98002-r and 12-02-00056 and integration project SB RAS no. 28, SS-4828.2012.2 grant, and Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (no. 8379). . - ISSN 1528-7483. - ISSN 1528-7505

РУБ Chemistry, Multidisciplinary + Crystallography + Materials Science, Multidisciplinary
Рубрики:
PHASE-TRANSITIONS
   OXYFLUORIDE
   ELPASOLITE
   (NH4)3MOO3F3
   (NH4)3WO3F3
   TEMPERATURE
   DYNAMICS
   N-2
   Cs
Аннотация: The λ-shaped line width broadening anomalies of octahedron group vibrations in Rb2KMoO3F3 disordered crystal have been revealed in the wide temperature range by Raman technique. The line width of Mo-O and Mo-F vibrations in this crystal is connected with the lattice disorder. The dependence of ordering degree passing the phase transition point history has been discovered. Wide temperature-line width area is found below structural phase transition where different lattice disorder can be obtained at a given temperature by varying the rate of sample cooling. The current study demonstrates the ability of a dynamic temperature regime to control ordering processes in crystals. © 2014 American Chemical Society.

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Держатели документа:
SB RAS, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
SB RAS, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Kolesnikova, E. M.; Колесникова, Евгения Михайловна; Isaenko, L. I.; Krylova, S. N.; Крылова, Светлана Николаевна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Russian Foundation for Basic Research [11-02-98002-r, 12-02-00056]; integration project SB RAS [28, SS-4828.2012.2]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [8379]
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Experimental and theoretical methods to study structural phase transition mechanisms in K3WO3F3 oxyfluoride / 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 1095-726X

РУБ Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
LATTICE-DYNAMICS
   RAMAN-SCATTERING
   ELPASOLITE
   (NH4)3WO3F3
   SPECTROSCOPY
   CRYSTALS
Кл.слова (ненормированные):
Raman spectroscopy -- IR spectroscopy -- NMR spectroscopy -- High hydrostatic pressure -- Oxyfluorides -- Lattice dynamics calculations
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]
}
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