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.
出处
《中国粉体技术》
CAS
北大核心
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
关键词
溶胶-凝胶法
电性能
物相结构
微观结构
sol-gel process
electric properties
phase structure
micro-structure
