(Sr_(1-x)Ba_x)La_4Ti_4O_(15)微波介质陶瓷的显微结构及介电性能  

Microstructure and Microwave Dielectric Properties of (Sr_(1-x)Ba_x)La_4Ti_4O_(15) Ceramics

作　　者：王利[1] 高峰[1] 张大帅[1] 王敏[1] 秦梦婕 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《压电与声光》2016年第2期207-211,216,共6页Piezoelectrics & Acoustooptics

基　　金：陕西省科学技术研究发展计划基金资助项目(2014K08-10);航空科学基金资助项目(20140853013)

摘　　要：采用传统的固相反应法制备(Sr1-xBax)La4Ti4O15(x=0~1,BSLT)微波介质陶瓷,并对其物相组成、晶体结构及微波介电性能进行分析。研究结果表明,Ba2+含量的增加降低了BSLT陶瓷的烧结温度,陶瓷的主晶相为(Sr,Ba)La4Ti4O15,并伴随有第二相La2TiO5的生成。在微波频率下,随Ba2+含量的增加,BSLT陶瓷的微波介电常数εr及品质因数与频率之积Q×f值先增大后减小,谐振频率温度系数τf为(-4^-11)×10-6/℃,优化出(Sr0.9Ba0.1)La4Ti4O15陶瓷具有最佳微波介电性能:εr=47.5,Q×f=31 582GHz,τf=-7.5×10-6/℃。（Sr1-xBax）La4Ti4O15（x=0～1,BSLT）microwave dielectric ceramics were fabricated by the conventional solid state reaction method.The phase composition,microstructure and microwave dielectric properties of BSLT ceramics were investigated.The results show that adding Ba2＋into BSLT ceramics would help to lower sintering temperature.The La2TiO5 main phase was observed in the ceramics besides the second phase of（Sr,Ba）La4Ti4O15.With increasing the content of Ba2＋,the dielectric constant and the value of Q×fincreases firstly and then decreases and the value of the temperature coefficient of resonance frequency ranges from-4×10-6/℃ to-11×10-6/℃.The ceramic with composition of（Sr0.9Ba0.1）La4Ti4O15 shows the optimal dielectric properties：εr=47.5,Q×f=31 582 GHz,τf=-7.5×10-6/℃.

关 键 词：(Sr1-xBax)La4Ti4O15 微波介质陶瓷 La2TiO5 显微结构 介电性能 

分 类 号：TN61[电子电信—电路与系统] TQ174.75[化学工程—陶瓷工业]