微波烧结对PLZT陶瓷电学性能的影响  

Effect of Microwave Sintering on Electrical Properties of PLZT Ceramics

作　　者：龙廉骏 徐建梅[1] 公衍生[1] 武明阳 崔新友 

机构地区：[1]中国地质大学(武汉)材料与化学学院,武汉430074 [2]武汉烽火富华电气有限责任公司,武汉430074

出　　处：《无机材料学报》2015年第5期500-504,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(61271141);武汉市应用基础研究项目(2015010101010009)~~

摘　　要：采用部分共沉淀法制备锆钛酸铅镧(PLZT)粉体,分别用普通马弗炉和微波马弗炉进行烧结成瓷,对比分析不同烧结方法对PLZT陶瓷的晶体结构、微观形貌和电学性能的影响。结果表明:微波烧结和常规烧结均成功制备出钙钛矿相PLZT陶瓷。采用微波烧结得到的PLZT陶瓷样品比常规烧结的晶粒细小,尺寸更均匀,孔洞较少;在电学性能相近时,微波烧结温度远低于常规烧结,且保温时间远小于常规烧结。在1000℃进行微波烧结,陶瓷的介电常数εr和压电常数d33最大,εr为2512,d33为405 p C/N,此时,剩余极化强度为16.5 k V/cm,矫顽场为8.2μC/cm2;在1250℃常规烧结,陶瓷的介电常数最大,为2822,压电常数最大,为508 p C/N,剩余极化强度为21.6 k V/cm,矫顽场为9.6μC/cm2。Lead lanthanum zirconate titanate（PLZT） powders synthesized by partial co-precipitation method were used to fabricate PLZT ceramics by conventional muffle furnace or by microwave muffle furnace. The crystal structure, microstructure, electrical properties of PLZT ceramics prepared by these two methods were investigated. The results show that the PLZT ceramics sintered by these two methods are pure perovskite structure. Microwave sintered PLZT ceramics possess smaller grain, more uniform size and less holes than do the conven tional prepared. The microwave sintering temperature is much lower than that by the conventional method, and the duration time is also much less, while the electrical properties of the ceramics sintered by these two methods are similar. The best properties of PLZT ceramics can be gained by microwave sintering at 1000℃ with dielectric constant and piezoelectric constant of 2512 and 405 p C/N. The remnant polarization is 16.5 k V/cm, and the coercive field is 8.2 μC/cm2. The dielectric constant and piezoelectric constant of PLZT ceramics sintered by conventional method at 1250 ℃reach the maximum values of 2822 and 508 p C/N. The remnant polarization is 21.6 k V/cm and the coercive field is 9.6 μC/cm2.

关 键 词：锆钛酸铅镧 微波烧结 压电性能 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]