Mg_4Nb_2O_9/SrTiO_3复合陶瓷的烧结特性和微波介电性能  

The Sintering Behavior and Microwave Dielectric Properties of Mg_4Nb_2O_9/SrTiO_3 Composite Ceramic

作　　者：姚国光[1] 刘鹏[2] 马红[1] 田秀劳[1] 

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：《材料研究学报》2010年第4期444-448,共5页Chinese Journal of Materials Research

基　　金：陕西省自然科学基金2009JM6001;陕西省教育厅09JK729资助项目~~

摘　　要：制备Li_2CO_3-V_2O_5(LV)共掺杂0.6Mg_4Nb_2O_9-0.4SrTiO_3复合陶瓷,研究了LV掺杂对其烧结特性、相结构和微波介电性能的影响。结果表明:一定量LV掺杂使0.6Mg_4Nb_2O_9-0.4SrTiO_3复合陶瓷生成了Sr(NbTi)O_(3+δ)和MgO杂相,并使其致密化烧结温度降低(至1175℃);1.5%LV掺杂,在1175℃烧结5 h的样品具有较高的微波介电性能:τ_f=0.15 ppm/℃,ε_τ=20.1,Q·f=10240 GHz(at 8.5 GHz)。The effects of Li2CO3-V2O5（LV） co-doped on the sinterability,phase compositions and microwave dielectric properties of 0.6Mg4Nb2O9-0.4SrTiO3 composite ceramics were investigated.It is found that the densification sintering temperature of 0.6Mg4Nb2O9-0.4SrTiO3 is lowed to 1175℃with an amount LV addtion.The second phases Sr（NbTi）O（3＋δ） and MgO were confirmed by the XRD and EDX spectrum analysis.The specimens with 1.5%LV sintered at 1175℃for 5 h shows excellent dielectric propertis：εr=20.1,Q·f=10240 GHz（at 8.5 GHz）,τf=0.15 ppm/℃.

关 键 词：无机非金属材料 Mg4Nb2O9-SrTiO3复合陶瓷 Li2CO3-V2O5添加剂 微波介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]