Influence of the thermal expansion on the piezoelectric photoacoustic detection of ferro-paraelastic phase transition in (CH3CH2NH3)2CuCl4
- 10 January 1985
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 18 (1), L13-L17
- https://doi.org/10.1088/0022-3719/18/1/003
Abstract
The ferro-paraelastic phase transition of (CH3CH2NH3)2 CuCl4 is studied by means of the photoacoustic (PA) technique using a piezoelectric detection system. Both the PA amplitude and phase exhibit a particularly unusual behaviour at the transition temperature, which is explained in terms of the dependence of the PA signal on the thermal expansion coefficient when the piezoelectric method is applied. Previously reported specific heat values together with additional measurements of the expansion coefficient allow the authors to obtain a quantitative adjustment of the PA amplitude curve in reasonable agreement with the experimental results.Keywords
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