成型工艺对PMN-PMS-PZT热释电陶瓷性能的影响

Effect of Molding Process on the Pyroelectric Properties of PMN-PMS-PZT Ceramics

采用干压、冷等静压和凝胶注模等不同成型工艺制备铌锰酸铅-锑锰酸铅-锆钛酸铅（PMN—PMS-PZT）陶瓷，并进行对比研究。实验结果表明，冷等静压成型的陶瓷综合性能较好，其具有均匀紧凑的晶粒结构，可得到较高的成瓷密度；使材料的介电常数εr，和介电损耗tanδ降低，在保持较高热释电系数p的同时降低低温铁电三方相-高温铁电三方相（FRL—FRH）的相变温度，并使热释电系数峰值得到稳定。其最佳性能为室温时，εr=216，tanδ=0．20％，p=12．0×10^-4C／m^2·℃（持续温区为23-55℃），探测率优值FD=24．6×10^-5Pa^-1/2。

The PMN-PMS-PZT ceramics was prepared by the solid-state, cold isostatic pressing and Gelcasting method respectively and a contrasted study of these preparing methods were carried out. The results indicated that the characteristics of PMN-PMS-PZT ceramics by cold isostatic pressing were best. It could possess high density of PMN-PMS-PZT ceramics and compact structure of grains by cold isostatic pressing method, and reduce the dielectric coefficient and dielectric loss. The temperature of FRL-FRH transition and the fluctuation of pyroelectric coeffi- cient were reduced without affecting pyroelectric coefficient. Based on this we have developed the PMN-PMS-PZT ceramics with good integrated properties. At room temperature, εr = 216, tan δ= 0. 20 %, p = 12.0× 10^-4 C/m^2 ·℃ （Its operating temperature range is from 23-55 ℃ ） and FD=24. 6 × 10^-5Pa^-1/z.