Re-examination of the phase transitions in ferroelectric solid solutions with perovskite structure

Abstract

Ferroelectric solid solutions have drawn considerable attention from the theoretical and industrial viewpoints. Recently, Yoshimitsu and Matsubara [1] published a phenomenological theory of the successive phase transitions in ferroelectric solid solutions, A_1-xA_x'BO₃ or AB_1-xB_x'O₃, with perovskite structure. They assumed that the thermodynamic potential can be expressed as

where coefficients X, ξ₁₁, ξ₁₂ and ζ are functions of x.