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Mel'Nikova, S. V.
Laptash, N. M.
Gorev, M. V.
Pogoreltsev, E. I.
2021-08-13T09:33:38Z
2021-08-13T09:33:38Z
2020
Mel'Nikova, S. V. Mixed-valence hydrated iron fluoridotitanate: Synthesis, optics and calorimetry [Текст] / S. V. Mel'Nikova, N. M. Laptash, M. V. Gorev, E. I. Pogoreltsev // Journal of Physics and Chemistry of Solids. — 2020. — № 142. — С. 109444
00223697
https://www.sciencedirect.com/science/article/pii/S0022369719327921?via%3Dihub
https://elib.sfu-kras.ru/handle/2311/142950
Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.
Mixed-valence hydrated fluoridotitanate with idealized formula FeTiF6·6H2O is the main product of fluoride processing of natural mineral ilmenite with hydrofluoric acid. Its single crystals were grown and optical and calorimetric experiments were carried out in the temperature range 200–350 K. Charge re-distribution, Fe2+Ti4+ to Fe3+Ti3+, in the compound studied was evident in XPS spectra. A first order ferroelastic phase transition occurs at temperatures T0↓ = 271.5 K, T0↑ = 274 ÷ 275.5 K with the symmetry change P3‾↔ P1‾. The structural transformation is accompanied by the appearance of a very weak optical anisotropy in the slice (001), a small anomaly of the heat capacity (ΔS = 1.5 J/mol K = 0.2R), and positive baric coefficients dT0/dp ≈ 30 ± 10 K/GPa. © 2020 Elsevier Ltd
crystal growth
fluoridotitanate
heat capacity
mixed valence
optical properties
phase transition
Mixed-valence hydrated iron fluoridotitanate: Synthesis, optics and calorimetry
Journal Article
Published Journal Article
109444
2021-08-13T09:33:38Z
10.1016/j.jpcs.2020.109444
Институт инженерной физики и радиоэлектроники
Кафедра теплофизики
Journal of Physics and Chemistry of Solids
Q2
Q2


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