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Soft optical phonon in ferroelastic BiVO4

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
24
Issue
2
Identifiers
DOI: 10.1016/0038-1098(77)90598-1

Abstract

Abstract We report the observation of an underdamped q∼O soft optical phonon in the Raman spectra of the paraelastic and ferroelastic phases of BiVO 4. This mode has the same symmetry as the ferroelastic strain. The temperature dependence of the soft optical phonon energy indicates that the ferroelastic transition is continuous and that the order parameter has a Landau-type behavior over a wide temperature range.

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