摘要
采用固相合成法制备了 ( 1-y)Ca1 -xLa2x/ 3 TiO3 -yCa(Mg1 / 3 Nb2 / 3 )O3 系列微波介质陶瓷材料 ,研究了复合系统的微波介电性能、烧结性能和微观结构。研究结果表明 :在y =0 .4～ 0 .6范围内 ,体系形成了单一的钙钛矿结构 ;当复合体系组成 0 .5Ca0 .6La0 .2 67TiO3 -0 .5Ca(Mg1 / 3 Nb2 / 3 )O3 时 ,在 14 0 0℃下烧结保温 4小时所得到材料的微波介电性能最佳 ;εf=5 5 ,Q×f =45 0 0 0GHz( 7.6GHz下 ) ,τf=0 .0 4ppm/℃。
y)Ca 1-x La 2x/3 TiO 3-yCa(Mg 1/3 Nb 2/3 )O 3 microwave dielectric ceramics were prepared by solid state reaction technique and the microwaev dielectric properties and microstructure were also investigated.The results show that a single perovskite structure formed within investigated composition range.The microwave properties of complex system largely depend on the composition.When x=0.4,y=0.5,(1-y)Ca 1-x La 2x/3 TiO 3-yCa(Mg 1/3 Nb 2/3 )O 3 ceramics obtained at 1400℃ for 4h exhibit excellent microwave dielectric properties:dielectric constant ε r=55,Q×f=45000GHz(at 7.6GHz),temperature coefficient of resonant frequency τ f=0.04ppm/℃.
出处
《陶瓷学报》
CAS
2004年第1期47-51,共5页
Journal of Ceramics
