Fourier transform infrared study of the phase transitions in (NH4)3VO2FO4

D. de Waal; A. M. Heyns

doi:10.1117/12.166772

31 January 1994 Fourier transform infrared study of the phase transitions in (NH₄)₃VO₂FO₄

D. de Waal, A. M. Heyns

Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166772
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

Abstract

Ammonium oxofluorovanadate compounds are known to show some potential as ferroelectric materials. The whole series of ammonium and sodium oxofluorovanadate compounds including Na₃VO₂F₄ have already been prepared and investigated by means of various techniques including x-ray diffraction, EPR, and vibrational spectroscopy. It was established that the pure ammonium compound shows the two above mentioned transitions from phase A (below 200 K) to phase B (between 200 and 400 K) and phase C (above 400 K) while Na(NH₄)₂VO₂F₄ has only one transition from phase A to phase B around 400 K⁴. In the present study various aspects regarding the nature of the structures of (NH₄)₃VO₂F₃ and Na(NH₄)₂VO₂F₄ and its influence on the phase transitions have been investigated.

Citation Download Citation

D. de Waal and A. M. Heyns "Fourier transform infrared study of the phase transitions in (NH₄)₃VO₂FO₄", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166772

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