V2O5掺杂对0.6SrTiO3-0.4LaAlO3微波介质陶瓷结构与性能的影响

采用固相反应法,研究了V2O5添加量与0.6SrTiO3-0.4LaAlO3(简称6ST-4LA)陶瓷烧结性能及介电性能之间的变化关系.结果表明:少量V2O5的引入未改变陶瓷的晶相组成,主晶相仍为SrTiO3基固溶体,适量添加V2O5不仅能显著降低6ST-4LA陶瓷的烧结温度,而且能增大其介电常数和品质因数(Q·f),调节谐振频率温度系数τf;随着V2O5添加量的继续增加,有第二相SrVO3出现并逐渐增多.当V2O5添加量为0.10wt;,1450 ℃烧结时,6ST-4LA陶瓷获得最佳微波介电性能:εr=46.46,Q·f=59219 GHz,τf=3×10-6 /℃.

Effect of V2O5 Doping on the Structure and Properties of 0.6SrTiO3-0.4LaAlO3 Microwave Dielectric Ceramics

The changing relationship between additive amount of V2O5 and the sintered properties, dielectric properties of 6ST-4LA microwave dielectric ceramics which prepared by conventional solid-state route were investigated.The results show that small addition of V2O5 does not change the crystal phase of 6ST-4LA ceramics, the main phase of samples is SrTiO3-based solid solution.Moderate addition of V2O5 could not only dramatically lower the sintering temperature which dropped to 1450 ℃, but also increase the dielectric constant and the Quality factor(Q·f), and adjust the τf.The second phase SrVO3 appeared and increased gradually with increasing the content of V2O5.The 0.10wt% V2O5-doped 6ST-4LA ceramics sintered at 1450 ℃ have the optimal integrated microwave dielectric properties: εr=46.46 , Q·f=59219 GHz, τf=3×10-6 /℃.