A study of phase transition in (NH 4 ) 3 WO 3 F 3 oxyfluoride by Raman scattering

Abstract Raman scattering spectra of perovskite‐like (NH 4 ) 3 WO 3 F 3 oxyfluoride are studied in the 70–3600 cm –1 frequency range and the 93–323 K temperature range including the transition point from orientationally disordered cubic phase into the lower symmetry one. Internal vibrations of ammon...

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Published inphysica status solidi (b) Vol. 243; no. 2; pp. 435 - 441
Main Authors Krylov, A. S., Gerasimova, J. V., Vtyurin, A. N., Fokina, V. D., Laptash, N. M., Voyt, E. I.
Format Journal Article
LanguageEnglish
Published 01.02.2006
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Summary:Abstract Raman scattering spectra of perovskite‐like (NH 4 ) 3 WO 3 F 3 oxyfluoride are studied in the 70–3600 cm –1 frequency range and the 93–323 K temperature range including the transition point from orientationally disordered cubic phase into the lower symmetry one. Internal vibrations of ammonium ions and WO 3 F 3 octahedra have been found to exhibit transition anomalies. Analysis of measurements suggests that the transition under study is due mainly to the ordering of octahedra. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.200541259