溶胶-凝胶法制备Ca_(0.9)La_(0.2/3)Cu_3Ti_4O_(12)陶瓷及电性能研究  

Synthesis and Electric Properties of Ca_(0.9)La_(0.2/3)Cu_3Ti_4O_(12) Ceramic by Sol-gel Method

作　　者：王秋丽[1] 王茂华[1] 万毅[1] 

机构地区：[1]常州大学化学化工学院,常州213164

出　　处：《硅酸盐通报》2012年第3期744-748,共5页Bulletin of the Chinese Ceramic Society

基　　金：常州科技创新项目(CC20110048);常州市科技计划项目(CN20100051)

摘　　要：以Ca(NO3)2.4H2O、Cu(NO3)2.3H2O、La(NO3)3、Ti(OC4H9)4为先驱体,利用溶胶-凝胶法合成了Ca0.9La0.2/3Cu3Ti4O12陶瓷粉体,研究了不同物相和粒径粉体的烧结特性以及陶瓷的介电性能和非线性性能。结果表明:干凝胶的煅烧温度低于450℃时,所得粉体主要为无定型态;煅烧温度超过500℃后,晶相开始大量形成;当以无定型粉体或500℃煅烧获得的细小粒径粉体为原料时,均难以获得致密结构的陶瓷;形成完整的粉体原料晶相以及粒径的增大,有利于陶瓷体的致密烧结及电性能的提高。粒径为250～350 nm的陶瓷粉体,在1050℃烧结后获得良好的电性能:介电常数εr=42748,非线性系数α=3.55。Using Ca （ NO3 ） 2· 4H2O, Cu （ NO3 ） 2· 3 H2 O, La（ NO3 ） 3, Ti （ OC4 H9 ） 4 as precursors, Ca0.9 La0.2、3Cu3Ti4O12 powders were prepared by sol-gel method. The crystalline phase, microstrueture, sintering characteristic, dielectric properties and nonlinearity of Ca0.9La0. 2/3 Cu3Ti4O12 powders calcined at different temperatures were studied. The result showed that the powders calcined at 450 ℃ are almost amorphous and a large amount of crystalline phaaes are occurred when the calcination temperature increases to 500℃. The dielectric ceramics made from amorphous powders or fine powders （ calcined at 50℃ ） cannot achieve compact structure, and the sintering characteristics and electrical properties can be enhanced by increasing the size of grains. Using Cao.9La0.2/3Cu3Ti4Ol2 powders with grain size of 250- 350 nm as raw materials, the ceramics sintered at 1050 ℃ possess good electric properties： εr = 42748,α =3.55.

关 键 词：溶胶-凝胶 Ca0.9La0.2/3Cu3Ti4O12 微观结构 电性能 

分 类 号：TQ174[化学工程—陶瓷工业]