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.
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