Preparation and characterization of new microwave dielectric ceramics Ba_(3-n)La_(1+n)Ti_nNb_(3-n)O_(12)  

作　　者：方亮 孟森森 张辉 吴伯麟 

机构地区：[1]Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education, Guilin University of Technology,Guilin 541004,China [2]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [3]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology, Wuhan 430070, China [4]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology,Wuhan 430070,China [5]Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education, Guilin University of Technology, Guilin 541004, China

出　　处：《中国有色金属学会会刊：英文版》2006年第B02期521-523,共3页Transactions of Nonferrous Metals Society of China

基　　金：Projects(50572078, 20571059) supported by the National Natural Science Foundation of China

摘　　要：A series of new microwave dielectric ceramics Ba3-nLa1+nTinNb3-nO12 (n=0,1,2) were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction, scanning electron microscope, and microwave dielectric properties measurements. These samples were identified as single phase and adopted A4B3O12-type cation-deficient hexagonal perovskite structure, which can be described as consisting of identical perovskite-like blocks, three corner-sharing BO6 octahedra thick, separated by layers of vacant octahedral. These ceramics have high dielectric constants in the range of 48-42, high quality factors (Q×f) up to 38 000 GHz, and low temperature coefficient of resonant frequencies (τf) in the range of (-40-+6)×10-6℃-1. With increasing content of La and Ti, the dielectric constants slightly decrease butτf gradually increases.A series of new microwave dielectric ceramics Ba3-nLa1＋nTinNb3-nO12 （n=0,1,2） were prepared in the BaO-La2O3-TiO2-Nb2O5 system by high temperature solid-state reaction route. The phase and structure of the ceramics were characterized by X-ray diffraction, scanning electron microscope, and microwave dielectric properties measurements. These samples were identified as single phase and adopted A4B3O12-type cation-deficient hexagonal perovskite structure, which can be described as consisting of identical perovskite-like blocks, three comer-sharing BO6 octahedra thick, separated by layers of vacant octahedral. These ceramics have high dielectric constants in the range of 48-42, high quality factors （Q×f） up to 38 000 GHz, and low temperature coefficient of resonant frequencies （τf） in the range of （-40-＋6）×10^-6 ℃^-1. With increasing content of La and Ti, the dielectric constants slightly decrease but re gradually increases.

关 键 词：微波陶瓷 介电性质 Ba3-nLa1+nTinNb3-nO12 BaO-La2O3-TiO2-Nb2O5 制备 

分 类 号：TQ174[化学工程—陶瓷工业]