(Ca_(1-x)Sr_x)[(Li_(1/3)Nb_(2/3))_(0.95)Zr_(0.15)]_(3+δ)陶瓷微波介电特性  

Microwave dielectric properties of (Ca_(1-x)Sr_x)[(Li_(1/3)Nb_(2/3))_(0.95)Zr_(0.15)]_(3+δ) ceramics

作　　者：周东祥[1] 熊钢[1] 龚树萍[1] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430070

出　　处：《功能材料》2007年第2期221-223,共3页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(2001AA-ZB3201-02);湖北省科技攻关计划资助项目(2004AA102A01)

摘　　要：研究了A位Sr2+取代对(Ca1-xSrx)[(Li1/3Nb2/3)0.95Zr0.15]3+δ(0.0≤x≤0.2,CSLNZ)陶瓷的微观结构及微波介电特性的影响。当0≤x≤20%(摩尔分数)时,体系为单一钙钛矿相,随Sr2+含量的增加,介电常数和谐振频率温度系数增大,而品质因素先增大,x=0.05时,开始下降。用键价理论分析了谐振频率温度系数随B位键价的变化关系。当Sr2+含量为5%(摩尔分数)时,陶瓷微波介电性能最佳:εr=32.5,Qf=13500GHz,τf=-2.4×10-6/℃。Crystal structure and microwave dielectric properties of （Ca1-x Srx ） [（Li1/3 Nb2/3 ）0.95 Zr0. 15]3＋δ （0.0≤X≤0.2,CSLNZ） ceramics were investigated . A single phase with orthorhombic perovskite structure was obtained at x=0.0 to 0.2. with an increasing of Sr^2＋ content, the εt, and τ value increased. However the Qf value firstly increased with increasing Sr^2＋ content, and then began to decrease at x=0.05. The variation of τf with Bsite bond valence was discussed by using the theory of bond valence, when x= 0.05, the optimum microwave dielectric properties. εt=32.5,Qf=13500GHz and τF=-2.4×10^-6/℃.

关 键 词：介电常数 品质因素 谐振频率温度系数 B位键价 

分 类 号：TQ174[化学工程—陶瓷工业]