Mg_4Nb_2O_9/CaTiO_3复合陶瓷的微波介电性能  

Microwave dielectric properties of Mg_4Nb_2O_9/CaTiO_3 composite ceramics

作　　者：姚国光[1] 刘鹏[2] 

机构地区：[1]西安邮电学院理学院,西安710121 [2]陕西师范大学物理与信息技术学院,西安710062

出　　处：《复合材料学报》2011年第1期94-98,共5页Acta Materiae Compositae Sinica

基　　金：陕西省自然科学基金(2009JM6001);陕西省教育厅项目(09JK729)

摘　　要：采用传统固相法制备Mg4Nb2O9/CaTiO3复合陶瓷,研究Li2CO3-V2O5(LV)共掺杂对其烧结特性、微观结构和微波介电性能的影响。实验结果表明:一定量的LV掺杂能够使Mg4Nb2O9/CaTiO3复合陶瓷的烧结温度降至1200℃;XRD和EDX综合分析表明,样品由(Mg4-xCax)Nb2O9/(Ca1-xMgx)TiO3两相所组成;陶瓷谐振频率温度系数趋近于零。含质量分数1.5%的LV,1200℃5、h烧结样品具有较好的微波介电性能:介电常数23.29,品质因数23460 GHz,谐振频率温度系数1.0×10-6℃-1,有望用作全球卫星定位系统微带天线基板材料。The Mg4Nb2O9-CaTiO3 composite ceramics were synthesised by the conventional solid-state reaction.The effects of Li2CO3-V2O5（LV） addition on the sintering behavior,microstructure and microwave dielectric properties of Mg4Nb2O9/CaTiO3 ceramics were investigated.It is found that an amount LV co-doped can effectively low the desification sintering temperature to 1200 ℃ of Mg4Nb2O9/CaTiO3 ceramics.Two-phase system was confirmed by the XRD and EDX spectrum analysis.A near zero temperature coefficient of resonant frequency was obtained.Inparticular,a new Mg4Nb2O9-CaTiO3 ceramics with 1.5% mass fraction of LV doped sintered at 1200 ℃ for 5 h exhibited excellent microwave dieletric properties of ε=23.29,Qf=23460 GHz and τf=1.0×10^-6 ℃^-1.It is proposed as a candidate subatrate material for GPS microstrip antenna.

关 键 词：复合陶瓷 介电性能 Li2CO3-V2O5添加 X射线衍射 烧结 

分 类 号：TQ174[化学工程—陶瓷工业]