溶胶-凝胶法制备CaCu_3Ti_4O_(12)粉体及其电性能  

Preparation of CaCu_3Ti_4O_(12) Powders by Sol-Gel Process and Electric Properties

作　　者：王茂华[1] 王秋丽[1] 张笑林[1] 

机构地区：[1]常州大学化学化工学院,江苏常州213164

出　　处：《中国粉体技术》2012年第5期32-36,共5页China Powder Science and Technology

基　　金：江苏省自然科学基金项目;编号:BK2009539;常州市科技创新项目;编号:CC20110048;常州市科技计划项目;编号:CN2010051

摘　　要：利用溶胶-凝胶法制备CaCu3Ti4O12粉体,采用差热分析、X射线衍射、扫描电子显微镜等技术进行表征,并探讨CaCu3Ti4O12粉体的烧结特性及电性能。结果表明,干凝胶经750℃低温煅烧可获得粒径分布较窄、平均粒径为80～100 nm的CaCu3Ti4O12粉体。CaCu3Ti4O12陶瓷在1 000℃时实现致密烧结,比固相反应法制备的粉体烧结温度降低100～200℃,具有较宽的烧结温区。溶胶-凝胶法制备的陶瓷经1 050℃烧结2 h,获得优良的电性能,相对介电常数为20 190,介电损耗为0.022,非线性系数为4.530。Cafu3Ti4O12 powders were prepared by sol-gel method and characterized by TG-DTA, XRD and SEM. The sintering characteristics and electric properties of CaCu3Ti4O12 powders were investigated. The results show that CaCu3Ti4O12 powders with a diameter of 80-100 nm and narrow particle size distribution can be obtained by low temperature calcining the xerogel at 750℃. CaCu3Ti4O12 ceramics made from the powder can be sintered at 1 000 ℃ to acquire the dense structure. The sintering temperature is lower by 100-200 ℃ than the sample obtained by solid reaction method using micron powders. The sintering range of CaCu3Ti4O12 ceramics is also widened. At the sintering temperature of 1 050 ℃ for 2 h,CaCu3Ti4O12 ceramics made from powder have good electric properties. The relative dielectric constant value is 20 190, loss tangent is 0.022, and nonlinear coefficient is 4.530.

关 键 词：溶胶-凝胶法 电性能 物相结构 微观结构 

分 类 号：TQ134.12[化学工程—无机化工]