| Author | Mel'Nikova, S. V. | |
| Author | Laptash, N. M. | |
| Author | Gorev, M. V. | |
| Author | Pogoreltsev, E. I. | |
| Accessioned Date | 2021-08-13T09:33:38Z | |
| Available Date | 2021-08-13T09:33:38Z | |
| Issued Date | 2020 | |
| Bibliographic Citation | 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 | |
| ISSN | 00223697 | |
| URI (for links/citations) | https://www.sciencedirect.com/science/article/pii/S0022369719327921?via%3Dihub | |
| URI (for links/citations) | https://elib.sfu-kras.ru/handle/2311/142950 | |
| Description | Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала. | |
| Abstract | 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 | |
| Subject | crystal growth | |
| Subject | fluoridotitanate | |
| Subject | heat capacity | |
| Subject | mixed valence | |
| Subject | optical properties | |
| Subject | phase transition | |
| Title | Mixed-valence hydrated iron fluoridotitanate: Synthesis, optics and calorimetry | |
| Type | Journal Article | |
| Type | Published Journal Article | |
| Pages | 109444 | |
| Update Date | 2021-08-13T09:33:38Z | |
| DOI | 10.1016/j.jpcs.2020.109444 | |
| Institute | Институт инженерной физики и радиоэлектроники | |
| Department | Кафедра теплофизики | |
| Journal Name | Journal of Physics and Chemistry of Solids | |
| Journal Quartile in Scopus | Q2 | |
| Journal Quartile in Web of Science | Q2 | |
