Investigation of Ferroelectric Phase Transition of Rochelle Salt

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