致密PZT95／5铁电陶瓷低温相结构与电性能研究  

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

作　　者：兰春锋[1] 聂恒昌[1] 陈学锋[1] 王军霞[1] 王根水[1] 董显林[1] 刘雨生[2] 贺红亮[2] 

机构地区：[1]中国科学院上海硅酸盐研究所,中国科学院无机功能材料与器件重点实验室,上海200050 [2]中国工程物理研究院流体物理研究所,冲击波物理与爆轰物理重点实验室,绵阳621900

出　　处：《无机材料学报》2013年第5期502-506,共5页Journal of Inorganic Materials

基　　金：上海市基础研究项目支持(10DJ1400203)~~

摘　　要：采用固相法制备了致密PZT95/5铁电陶瓷,研究了低温下致密PZT95/5铁电陶瓷相结构和电性能的变化规律。变温X射线衍射(XRD)研究表明,低温(–60℃)下极化和未极化致密PZT95/5铁电陶瓷相结构保持不变。电性能研究表明随着温度从30℃下降至–60℃,致密PZT95/5铁电陶瓷的相对介电常数从278显著下降至173,而电阻率和剩余极化强度基本保持不变。结合冲击波载荷下动态放电模拟分析,发现相对介电常数的降低将引起动态电场增大至常温下的1.5倍,这可能是导致致密PZT95/5铁电陶瓷低温下击穿概率显著增大的关键因素。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℃ 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.

关 键 词：PZT95 5铁电陶瓷 低温 相结构 电性能 

分 类 号：TQ174[化学工程—陶瓷工业]