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 un- changed 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℃ to -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 dy- namic electric field at -60℃ which 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.