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A raman scattering study of the phase transition in the ammonium oxyfluoride (NH4)3TiOF5 |
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| Authors: | Yu. V. Gerasimova A. S. Krylov A. N. Vtyurin N. M. Laptash S. V. Goryaĭnov |
| Affiliation: | (1) Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, Krasnoyarsk, 660036, Russia;(2) Siberian Federal University, Svobodnyĭ pr. 79, Krasnoyarsk, 660041, Russia;(3) Institute of Chemistry, Far-East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia;(4) Institute of Mineralogy and Petrography, Siberian Branch, Universitetskiĭ pr. 3, Novosibirsk, 630090, Russia |
| Abstract: | Raman spectra of a polycrystalline sample of the perovskite-like oxyfluoride (NH4)3TiOF5 are measured in the frequency region 100–3600 cm?1 at temperatures ranging from 91 to 370 K under hydrostatic pressures of up to 9 GPa, which include the range of the phase transition from the orientationally disordered cubic phase to the low-symmetry phase. Anomalies in the spectral parameters due to the phase transition are revealed in the range of vibrations of TiOF5 octahedral groups. |
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