Abstract
The phenomenological theory has been applied to investigate the phase transition of the Rochelle salt crystal. The Helmholtz free energy expansion of the Rochelle salt crystal is obtained by using the basis functions of all the irreducible representations of the paraelectric phase group D 2 . An appropriate explanation of the existence of two Curie temperatures in the ferroelectric phase transition of the Rochelle salt crystal is put forward. The temperature dependence of the spontaneous polarization is obtained. The independent components of the reciprocal susceptibility in both the paraelectric phase and the ferroelectric phase are calculated out. The theoretical curves of the spontaneous polarization and the main reciprocal susceptibility ζ 11 varying with the temperature accord with the experimental results of other literatures.
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