ABSTRACT
In this investigation we discuss a thermodynamic consistent model for an assumed transversely isotropic ferroelectric crystal. Due to the ferroelectric phase transition, that occurs at the so-called electric coercive field, we observe, within a certain range of temperature and under applied oscillating electric fields, two leading hysteresis effects. These are the polarization-electric-field and the strain-electric-field (butterfly) hysteresis loop. The main goal of this paper is to capture these fundamental characteristics of such ceramics.