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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Yu. V., Laptash N. M., Krylov A. S., Vonog V., Vtyurin A. N.
Заглавие : Structural phase transition in (NH4)3GeF7– Raman spectroscopy data
Место публикации : Crystals. - 2021. - Vol. 11, Is. 5. - Ст.506. - ISSN 20734352 (ISSN), DOI 10.3390/cryst11050506
Примечания : Cited References: 22. - This research was partially funded by RFBR and DFG, project No. 21-52-12018
Аннотация: We obtained Raman spectra of (NH4)3GeF7 crystals with a wide range of frequencies (10–3400 cm−1) and temperatures (8–300 K), including phase transition, which was accompanied by a symmetry increase with a temperature decrease. The internal vibrations of the GeF62− group were classified by the positional symmetry method. Considerable transformations of the Raman spectra were observed at the lower frequency range of lattice vibrations and the ranges of the internal vibrations of the ammonium ions. In contrast, the internal modes of the GeF62− groups changed only slightly due to their resonance splitting in the multiplied unit cell, which agreed well with the proposed phase transition mechanism induced by ammonium group ordering.
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2.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bogdanov E. V., Molokeev M. S., Gorev M. V., Kartashev A. V., Laptash N. M., Flerov I. N.
Заглавие : Phase transition in RbCdZrF7: Structure and thermal properties
Место публикации : J. Fluor. Chem. - 2021. - Vol. 245. - Ст.109748. - ISSN 00221139 (ISSN), DOI 10.1016/j.jfluchem.2021.109748
Примечания : Cited References: 30. - The reported study was funded by RFBR according to the research project No. 18-02-00269 a. X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: X-ray, calorimetric and dilatometric studies of RbCdZrF7 revealed the existence of the second order phase transition Cmcm - P21/m at T0 = 200 K. The structure of the initial and distorted phases is ordered. The phase transition is associated with displacements of fluorine atoms, which leads to minor rotations of the CdF7 and ZrF7 pentagonal bipyramids. A small change in entropy, 0.1R, is characteristic of displacive-type transformations. An anomalously high susceptibility of the transition temperature to hydrostatic pressure was found.
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Molokeev M. S., Kartashev A. V., Pogoreltsev E. I., Mel'nikova S. V., Laptash N. M., Flerov I. N.
Заглавие : Investigation of thermal properties and structure of complex fluoride K3ZrF7
Место публикации : J. Fluor. Chem. - 2021. - Vol. 241. - Ст.109677. - ISSN 00221139 (ISSN), DOI 10.1016/j.jfluchem.2020.109677
Примечания : Cited References: 44. - The reported study was funded by RFBR according to the research project No. 18-02-00269 a. X-ray and dilatometric data were obtained using the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: X-ray, calorimetric and dilatometric studies of K3ZrF7 revealed the existence of the phase transition Fm-3m ↔ R-3m at T0 = 320 K. The structural model assumes a disorder of a pentagonal bipyramid ZrF7 with the following ratio of equivalent orientation positions in the initial and distorted phases: 12 to 6. A good agreement was found between the experimental and model-calculated changes in strain and entropy during the phase transition. A comparative analysis of entropy and structural parameters of related fluorides K3ZrF7 - (NH4)2KZrF7 - (NH4)3ZrF7 was performed. The anomalous behavior of thermodynamic properties in the range 140−230 K is not typical for phase transitions and is accompanied by a significant change in the entropy of the crystal lattice.
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4.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bogdanov E. V., Gorev M. V., Flerov I. N.
Заглавие : Effect of deuteration on the barocaloric properties of complex vanadates (NH4)3VOxF6−x (x: 1, 2)
Место публикации : Solid State Sci. - 2022. - Vol. 133. - Ст.107022. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2022.107022
Примечания : Cited References: 28
Аннотация: We report on the analysis of intensive and extensive barocaloric properties and their sensitivity to deuteration of complex oxyfluorides (NH4)3VOxF6−x (x: 1, 2) undergoing a similar sequence of structural phase transitions. Due to the high sensitivity to hydrostatic pressure and the strong disordering of six-coordinated anionic fluoro-oxygen species, (NH4)3VO2F4 and (ND4)3VO2F4 crystals demonstrate the highest barocaloric efficiency at low pressure, p = 0.1 GPa, during the phase transition from the initial cubic phase: barocaloric coefficients reach large values |ΔSBCE|/p ≈ 400 J/(kg K GPa) and ΔTAD/p ≈ 80 K/GPa. Anionic, [VOF5] → [VO2F4], and cationic, [ND4] → [NH4] substitutions are accompanied by a decrease in the disorder of structural units in the cubic phase, which leads to a decrease in changes in entropy and temperature under pressure. The contribution of thermal expansion of the crystal lattice to the total intensive and extensive barocaloric effects is large and amounts to about 30–40%.
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5.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Flerov I.N., Gorev M.V.
Заглавие : Oxyfluorides and fluorides - new solid refrigerants
Коллективы : "Inorganic fluorides for chemistry and environment, Optics and electronics", International Meeting
Место публикации : International Meeting "Inorganic fluorides for chemistry and environment, Optics and electronics". - 2010. - P.31
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6.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Fokina V. D., Bovina A. F., Bogdanov E. V., Pogoreltsev E. I., Laptash N. M.
Заглавие : Disorder and phase transitions in oxyfluoride (NH4)(3)Ta(O-2)(2)F-4
Место публикации : J. Fluor. Chem. - 2011. - Vol. 132, Is. 10. - P.713-718. - ISSN 0022-1139, DOI 10.1016/j.jfluchem.2011.05.012
Примечания : Cited Reference Count: 19. - Гранты: This work was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation (NSh-4645.2010.2).Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools of the Russian Federation [NSh-4645.2010.2]
Предметные рубрики: HEAT-CAPACITY
COMPLEXES
RB2KTIOF5
FLUORIDES
CRYOLITE
Ключевые слова (''Своб.индексиров.''): cubic oxyfluorides--structural disorder--phase transitions--entropy--permittivity--pressure effect--cubic oxyfluorides--entropy--permittivity--phase transitions--pressure effect--structural disorder
Аннотация: Calorimetric, X-ray, dielectric and DTA under pressure measurements have been performed on oxyfluoride (NH4)(3)Ta(O-2)(2)F-4. The succession of nonferroelectric phase transitions was found associated with the order-disorder processes. The comparative analysis tantalate with related niobate has revealed the important role of the central atom in the physical properties behavior, mechanism of structural distortions and barocaloric effect in oxyfluorides with the eight-coordinated anionic polyhedra. (C) 2011 Elsevier By. All rights reserved.
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimova Yu. V., Krylov A. S., Vtyurin A. N., Laptash N. M., Krylova S. N.
Заглавие : Ferroelastic phase transition in the family of double fluoride crystals by Raman spectroscopy
Коллективы : European Meeting on Ferroelectricity
Место публикации : Ferroelectrics. - 2020. - Vol. 568, Is. 1. - P.185-190. - DOI 10.1080/00150193.2020.1713348
Примечания : Cited References: 14. - This research is supported by Russian Foundation for Basic Research under Grant No. 17-02-00920
Аннотация: In order to clarify ordering mechanisms of ferroic phase transitions in double fluoride salts (NH4)3SnF7, (NH4)3GeF7 and (NH4)3TiF7, their Raman scattering spectra have been studied in wide ranges of frequencies (20–3400 cm−1) and temperatures (8–410 K). Substitution of the central ion in the octahedron groups was found to change not only the phase transition types and sequences, but to modify the types of structural disorder as well, which is a special feature of these high-symmetry fluoride crystals.
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8.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gerasimova Y. V., Krylov A. S., Vtyurin A. N., Laptash N. M.
Заглавие : Ferroelastic phase transition in the family of crystals of double salts of fluorides according to vibrational spectroscopy data
Коллективы : IEEE International Symposium on Applications of Ferroelectrics, International Conference on ElectroCeramics, European Meeting on Ferroelectricity, International Workshop on PiezoMEMS, Piezoresponse Force Microscopy Workshop
Место публикации : Joint Conference of the IEEE ISAF, EMF, ICE, IWPM and PFM: Abstract book. - 2019. - P.174
Примечания : Cited References: 3. - The study was carried out with the financial support of the Russian Foundation for Basic Research №17-02-00920
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9.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Krylov A. S., Voronov V. N., Oreshonkov A. S., Krylova S. N.
Заглавие : Structural phase transitions in elpasolite-like fluorides comprising rare earth elements – Raman scattering study
Коллективы : Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Scanning Probe Microscopy, International Conference, Russia-China Workshop on Dielectric and Ferroelectric Materials, "Functional Imaging of Nanomaterials", International Youth Conference
Место публикации : 3th Int. Conf. "Scanning Probe Microscopy". 4th Russia-China Workshop on Dielectric and Ferroel. Mater. (SPM-2019-RCWDFM). Int. Youth Conf. "Functional Imaging of Nanomaterials": Abstract book of joint int. conf. - 2019. - P.29. - ISBN 978-5-9500624-2-1
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gorev M. V., Bogdanov E. V., Flerov I. N.
Заглавие : Fluorides and oxyfluorides: successive ferroelastic phase transitions and barocaloric effect
Коллективы : Fall Meeting, European Materials Research Society, European Materials Research Society, Warsaw University of Technology
Место публикации : E-MRS fall meeting: conference programme. - 2019. - С. E.P.2
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