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Phase behaviour, thermal expansion and compressibility of SnMo 2 O 8

Araujo, Luiza R.; Gallington, Leighanne C.; Wilkinson, Angus P.; Evans, John S.O.

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Authors

Luiza R. Araujo

Leighanne C. Gallington

Angus P. Wilkinson



Abstract

The phase behaviour and thermoelastic properties of SnMo2O8, derived from variable temperature and pressure synchrotron powder diffraction data, are reported. SnMo2O8 is a member of the AM2O8 family of negative thermal expansion (NTE) materials, but unexpectedly, has positive thermal expansion. Over the P-T space explored (298–513 K, ambient to 310 MPa) four different forms of SnMo2O8 are observed: α, β, γ and γ′. The γ to β transition is temperature-, pressure-, and time-dependent. SnMo2O8 is a much softer material (α and γ form have BT = 29 and 26 GPa at 298 K) than other members of the AM2O8 family. Counter-intuitively, its high temperature β phase becomes stiffer with increasing temperature (BT ∼36 GPa at 490 K). The pressure dependence of the thermal expansion for each phase is reported.

Citation

Araujo, L. R., Gallington, L. C., Wilkinson, A. P., & Evans, J. S. (2018). Phase behaviour, thermal expansion and compressibility of SnMo 2 O 8. Journal of Solid State Chemistry, 258, 885-893. https://doi.org/10.1016/j.jssc.2017.08.040

Journal Article Type Article
Acceptance Date Aug 24, 2017
Online Publication Date Sep 6, 2017
Publication Date Feb 1, 2018
Deposit Date Feb 1, 2018
Publicly Available Date Sep 6, 2018
Journal Journal of Solid State Chemistry
Print ISSN 0022-4596
Electronic ISSN 1095-726X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 258
Pages 885-893
DOI https://doi.org/10.1016/j.jssc.2017.08.040

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