Research on Low-temperature Phase Structures and Electrical Properties of Dense PZT 95/5 Ferroelectric Ceramics

Dense PZT 95/5 ferroelectric ceramics were fabricated by solid-state reaction method. Low-temperature phase structures and electrical properties of dense PZT 95/5 ferroelectric ceramics were investigated. X-ray diffraction (XRD) results show that the phases of both poled and unpoled dense PZT 95/5 ferroelectric ceramics almost keep unchanged at different temperature. The remanent polarization calculated from the pyroelectric current and the resistance of dense PZT 95/5 ferroelectric ceramics changes little at low temperature (–60 However, when the temperatue is reduced from 30 o –60 the relative dielectric constant dramatically decreases from 278 to 173. According to the dynamic discharge model analysis, the sharp decrease of dielectric constant results in the remarkable increase of dynamic electric field at –60 hich is 1.5 times higher than that at room temperature. This could be the dominant reason for the high dielectric breakdown probability of dense PZT 95/5 ceramics at low temperature under shock wave loading.