Ba_3Ti_(5+x)Nb_(6-x)O_(28-x/2)陶瓷微波介电性能  

Microwave Dielectric Properties of Ba_3Ti_(5+x)Nb_(6-x)O_(28-x/2) Ceramics

作　　者：林佳[1] 郑兴华[1] 梁炳亮[1] 汤德平[1] 

机构地区：[1]福州大学材料科学与工程学院,福州350108

出　　处：《硅酸盐通报》2009年第4期656-660,共5页Bulletin of the Chinese Ceramic Society

基　　金：福建省科技重大专项(2005HZ02-3);福建省高等学校新世纪优秀人才支持计划(XSJRC2007-16);福州大学发展基金(2007-XQ-01)资助

摘　　要：本文采用固相反应法制备了Ba3Ti5+xNb6-xO28-x/2系微波介质陶瓷。通过密度、XRD及SEM等探讨了烧结特性、物相组成、显微结构与其微波介电性能的关系。x<0.2时形成Ba3Ti5Nb6O28固溶体;0.2≤x时,则出现了Ba3Ti4Nb4O21第二相;x=1时,Ba3Ti4Nb4O21成为主相。获得了一些微波介电性能优异的Ba3Ti5+xNb6-xO28-x/2陶瓷,其微波介电性能如下:εr=37.7、Q×f=32420GHz、τf=25ppm/℃(x=0.05);εr=38.3、Q×f=28419GHz、τf=-12ppm/℃(x=0.1)。Microwave dielectric ceramics of Ba3Ti5 ＋x Nb6-x O28-x/2 were prepared by solid state reaction. The relationships between sintering behavior, phase composition, microstructure and microwave dielectric properties of Ba3Ti5＋xNb6-xO28-x/2 ceramics were investigated by density, XRD, SEM, et al, The solid solution of Ba3Ti5Nb6O28 is formed when x is below 0. 2. The secondary phase of Ba3Ti4Nb4O21 appears with x beyond 0.2. Ba3Ti4Nb4O21 becomes major phase for x = 1. The Ba3Ti5 ＋xNb6-xO28-x/2 ceramics with excellent microwave dielectric properties are achieved as following： εr =37.7, Q × f= 32420 GHz and τf =25 ppm/℃ for x =0.05 ;εr =38. 3, Q ×f=28419 GHz, τf = -12 ppm/℃ for x =0.1 ,respectively.

关 键 词：微波陶瓷 介电常数 品质因数 谐振频率温度系数 

分 类 号：TQ174.75[化学工程—陶瓷工业]