Microwave Dielectric Properties of Ca1-x(Li1/2Sm1/2)xTiO3 Ceramics

摘要

Ca1-x(Li1/2Sm1/2)xTiO3 microwave dielectric ceramics in the x range of 0.70 ～ 0.80 were prepared by conventional ceramics fabrication technique.The crystal structure,microstructure and microwave dielectric properties were investigated.The results showed that a single orthorhombic perovskite structure formed within this x range,and the substitution of (Li1/2Sm1/2)2+ ion for Ca2+ ion in A-site has a significant influence on the microwave dielectric properties of the ceramics.With the increase of substitution of (Li1/2Sm1/2)2+ ion with 0.75,the temperature coefficient of resonant frequency τf reaches zero,and it could be attributed that the Sm and Li have a polarizability effect according to its microstructure.The Ca0.25(Li1/2Sm1/2)0.75TiO3 ceramic had a good performance with microwave dielectric properties ofτf =0 ppm/°C,εr =105.83,and Qf=3170 GHz..