Temperature evolution of the ferroelastic order parameter of As2O5as determined from optical birefringence
- 30 August 1987
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 20 (24) , 3613-3620
- https://doi.org/10.1088/0022-3719/20/24/004
Abstract
The temperature evolution of the optical birefringence of ferroelastic arsenic pentoxide is shown to reflect the order parameter behaviour in the temperature interval from 300 K to Tc=575.7 K. The phase transition is second order and the critical exponent of the order parameter is 0.509 (10); deviations from mean-field behaviour were found at temperatures closer than 5 K to Tc.Keywords
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