(1-x)Ba_4LiNb_3O_(12)-xBaTiO_3(x=0～0.40)钙钛矿陶瓷的结构与微波介电性能  

Structures and Microwave Dielectric Properties of (1-x)Ba_4LiNb_3O_(12)-xBaTiO_3(x=0～0.40) Perovskite Ceramics

作　　者：田彩兰[1] 岳振星[1] 张杰[1] 

机构地区：[1]清华大学 国家新型陶瓷与工艺重点实验室,北京100084

出　　处：《稀有金属材料与工程》2013年第S1期171-174,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50972074;50921061;50672043);国家科技部"973"项目(2009CB623306)

摘　　要：采用传统的固相法合成了(1-x)Ba4LiNb3O12-xBaTiO3(x=0～0.40)钙钛矿陶瓷。通过XRD,Raman,SEM以及电学测试对材料的结构和性能进行表征。XRD和Raman结果表明,Ti4+不利于六方相的稳定,一旦出现,部分或全部六方相即转变为立方相。随着x增大,陶瓷的介电常数(εr)逐渐增加,品质因数(Q×)逐渐降低,频率温度系数(τ)逐渐增加。立方相陶瓷与六方的相比,有较高的εr,较低的Q×和较大的τ。讨论了六方相的稳定性以及结构与性能之间的关系。(1-x)Ba4LiNb3O12-xBaTiO3(x=0～0.40) perovskite ceramics were synthesized by the conventional solid state reaction method. XRD, Raman, and SEM were used to analyze the crystal structure, while the dielectric measurements were also carried out to characterize the samples. From the XRD and Raman results, the structures of samples transform from the hexagonal structure to the cubic one on the presence of Ti4+ substitution. With increasing x, the ceramics have the increased dielectric constant (εr ), the decreased quality factor (Q×), and the increased temperature coefficient of resonant frequency (τf ). Compared with the cubic phase, the hexagonal one has the higher Q×, the lower εr and the nearer-zero τf . The stability of the hexagonal structure and the relationship between structure and microwave dielectric properties were discussed.

关 键 词：(1-x)Ba4LiNb3O12-xBaTiO3 六方钙钛矿 稳定 微波介质 

分 类 号：TQ174.1[化学工程—陶瓷工业]