The ferro-paraelastic phase transition of (CH 3 CH 2 NH 3 ) 2 CuCl 4 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.
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Etxebarría et al. (1985) studied this question.
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