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

Microwave Dielectric Properties of (Ca_(1-x)Ba_x)[(Li_(1/3)Nb_(2/3))_(0.95)Zr_(0.15))]O_(3+δ) Ceramics

作　　者：熊钢[1,2] 周东祥[2] 李忠明[1] 

机构地区：[1]咸宁学院信息工程学院,湖北咸宁437000 [2]华中科技大学电子科学与技术系,湖北武汉430074

出　　处：《压电与声光》2009年第4期562-564,共3页Piezoelectrics & Acoustooptics

基　　金：湖北省科技攻关计划基金资助项目(2004AA102A01);湖北省教育厅重点基金资助项目(D200628002)

摘　　要：研究了A位Ba2+取代对(Ca1-xBax)[(Li1/3Nb2/3)0.95Zr0.15]O3+δ(0≤x≤0.2,CBLNZ)陶瓷的微观结构及微波介电特性的影响。当0≤x≤0.025时,体系为单一钙钛矿相,随Ba2+含量的增加,谐振频率温度系数(τf)由-9.4×10-6/℃增加到18×10-6/℃,而品质因数(Q)先增大;当x=0.025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x(Ba2+)=2.5%时,陶瓷微波介电性能最佳,即介电常数εr=34.3,品质因数与频率的乘积Q.f=13 400 GHz,τ=-2.1×10-6/℃。Crystal structure and microwave dielectric properties of （Ca1-xBax）[（Li1/3Nb2/3）0.95Zr0.15）]O3＋δ（0≤x≤0.2,CBLNZ） ceramics were investigated. A single phase with orthorhombic perovskite structure was obtained at x=0-0. 025. With an increasing of Ba2＋ content, the rf value increased from-- 9.4 ×10^-6/℃ to 18 ×10^-6/℃. However the Q · f value firstly increased with increasing Ba2＋ content,and then began to decrease at x=0. 025. The variation of τf with B-site bond valence was discussed by using the theory of bond valence. When x= 0. 025, the optimum microwave dielectric properties were as follows ：εr = 34.3, Q · f = 13 400 GHz and rs ~ --2.1 ×10^-6/℃.

关 键 词：微波介质陶瓷 介电常数 品质因数 谐振频率温度系数 B位键价 

分 类 号：TN015[电子电信—物理电子学] O482.4[理学—固体物理]