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Structures and phase transitions of trigonal ZrMo2O8 and HfMo2O8

Allen, S.; Ward, R.J.; Hampson, M.R.; Gover, R.K.B.; Evans, J.S.O.

Authors

S. Allen

R.J. Ward

M.R. Hampson

R.K.B. Gover



Abstract

This paper describes the structures, thermal-expansion properties and phase transitions of the trigonal forms of ZrMo2O8 and HfMo2O8. Both phases adopt a P(3) over bar m structure at room temperature and show positive thermal expansion. Both phases also undergo a displacive phase transition at high temperature (ZrMo2O8 at 487 K and HfMo2O8 at 463 K) to a higher-symmetry structure that has lower thermal expansion. The structure of the high-temperature alpha'-AMo(2)O(8) form (A = Zr and Hf) has been refined from powder diffraction data in space group P(3) over bar m1.

Citation

Allen, S., Ward, R., Hampson, M., Gover, R., & Evans, J. (2004). Structures and phase transitions of trigonal ZrMo2O8 and HfMo2O8. Acta crystallographica. Section B, Structural science, 60, 32-40

Journal Article Type Article
Publication Date 2004-02
Journal Acta crystallographica. Section B, Structural science.
Print ISSN 0108-7681
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 60
Pages 32-40