Investigation of the character of the phase transitions in Nb doped Zr-rich PZT by pyroelectric and dielectric measurements

摘要

We present a study of the character of the phase transitions of the solid solution PbZr_(1-x)Ti_xO_3. Using the spontaneous polarization curves we determined the mean-field parameters. These parameters show the first order character of the phase transitions for the richer Zr content and its evolution with composition. The F_(RL)-F_(RH) phase transition presents also first order character for high contents of Zr. The study of the thermal hysteresis, and the jump of the spontaneous polarization, allowed us to investigate this phase transition with composition.