Spontaneous strain and the ferroelastic phase transition in As2O5
- 20 January 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (2), 277-285
- https://doi.org/10.1088/0022-3719/21/2/011
Abstract
The tetragonal-orthorhombic phase transition in arsenic pentoxide has been studied by X-ray powder diffraction and is found to be a proper ferroelastic transition. The spontaneous strain behaves as the order parameter following Landau theory with epsilon s varies as mod Tc-T mod beta , beta =1/2, Tc=578 K. The order parameter susceptibility has been determined from line broadening and follows mod Tc-T mod -y, gamma =1. No deviation from Landau behavior has been observed experimentally.Keywords
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