预烧温度对ZnNb_2O_6陶瓷结构与微波介电性能的影响  

Effects of Pre-sintering Temperature on Structure and Microwave Dielectric Properties of ZnNb_2O_6 Ceramics

作　　者：宋福生[1,2] 李月明[1,2] 洪燕 沈宗洋[1,2] 谢志翔 廖润华[1,2] 

机构地区：[1]景德镇陶瓷学院,国家及日用建筑陶瓷工程技术研究中心 [2]江西省先进陶瓷材料重点实验室,景德镇333403

出　　处：《中国陶瓷》2016年第4期29-33,共5页China Ceramics

基　　金：江西省"赣鄱英才555工程"领军人才支持科技计划;江西省教育厅科技项目(KJLD12084;GJJ12498);江西省青年科学家培养对象计划项目(20142BCB23020);景德镇科技局项目(701301-350)

摘　　要：采用传统固相法制备了ZnNb_2O_6微波介质陶瓷。研究了预烧温度对ZnNb_2O_6陶瓷的相结构、显微结构以及微波介电性能的影响。研究结果表明:预烧温度的变化对ZnNb_2O_6陶瓷的物相组成基本没有影响;随着陶瓷粉料预烧温度的上升,ZnNb_2O_6陶瓷的介电常数εr和品质因数Qf均呈现先增后降的变化规律,而陶瓷的谐振频率温度系数τf则向负值增大的方向变化;经950℃预烧处理的ZnNb_2O_6陶瓷粉体在1170℃烧结4 h可获得较佳的微波介电性能:ε_r=24.15,Q×f=69160 GHz,τf=-78×10^(-6)/℃。ZnNb_2O_6 microwave dielectric ceramics were prepared by the traditional solid-state method. The effects of pre-sintering temperature on the phase structure, microstructure and microwave dielectric properties of the ceramics were investigated. The results indicated that the change of the pre-sintering temperature had no effect on the phase composition of ZnNb_2O_6 ceramics. With the increase of pre-sintering temperature of ceramic powders, the dielectric constant（εr） and the quality factor（Q×f） of ZnNb_2O_6 ceramics increased first and then decreased. However, the negative value of the temperature coefficient of the resonant frequency τf showed increase trend. The optimal microwave dielectric properties of ε_r=24.15, Qf=69160 GHz,τf=-78×10^-6/ ℃ were obtained for ZnNb_2O_6 ceramics sintered at 1170 ℃ for 4 h by pre-sintered at 950 ℃

关 键 词：ZnNb_2O_6 预烧温度 物相组成 微波介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]