CTLA陶瓷微波介电性能及烧结特性研究

Study on the Microwave Dielectric and Sintering Properties of CTLA Ceramics

采用固相反应法制备了0.65CaTiO3-0.35LaAlO3(CTLA)陶瓷,研究了CTLA陶瓷的物相组成、烧结特性及微波介电特性。结果表明,CTLA陶瓷只含有Ca0.65La0.35Al0.35Ti0.65O3主晶相,不存在第二相。烧结温度在1 380～1 450℃间,陶瓷的微波介电性能最佳,介电常数εr=44.5,频率温度系数τf≈0,品质因数与频率之积Q×f≈43 948GHz。当w(Nb2O5)=10%时能使陶瓷致密化烧结温度降到1 300℃,但微波性能变差,εr=38.3,τf=-2.8×10-6/℃,Q×f=13 260GHz。

The microwave dielectric ceramics 0.65CaTiO3-0.35LaAlO3（CTLA） was prepared by solid state reaction technique.The crystal structure,sintering properties and microwave dielectric properties of the CTLA ceramics were investigated.The results showed that the CTLA ceramics only had the main phase of Ca0.65La0.35Al0.35Ti0.65O3 without a second phase.The CTLA ceramics sintered between 1 380-1 450 ℃ exhibited excellent microwave dielectric properties：εr=44.5,τf≈0,Q×f≈43 948 GHz.The additives of 10% Nb2O5 increased densification sintering temperature to 1 300 ℃ but microwave properties was variant.εr=38,τf=-2.8×10^-6/°C and Q×f=13 260 GHz.