Microwave Dielectric Properties of Low-Loss (1-x) Ca<sub>0.6</sub>Sm<sub>0.267</sub>TiO<sub>3</sub>–xSmAlO<sub>3</sub> Ceramics

Abstract

Abstract:A novel compositions in the (1-x) Ca 0.6 Sm 0.267 TiO 3 -xSmAlO 3 system were prepared via conventional mixed oxide route in order to modify the postive temperarure coefficient of resonnant frequency(ô f ) of Ca 0.6 Sm 0.267 TiO 3 .The microwave dielectric properties and phase composition of this system ceramics were investigated. X-ray powder diffraction results showed that Ca 0.6 Sm 0.267 TiO 3 and SmAlO 3 formed a solid solution when 0.05≤x≤0.20. Microstructures of the sintered ceramics were observed by SEM; dielectric properties of the samples were also measured. The ô f values showed a near linear decrease with increasing additions of SmAlO 3 . A dielectric constant of 53.1, Qf value of 24,085GHz and ô f value of +13.3ppm/°C were obtained for 0.80Ca 0.6 Sm 0.267 TiO 3 -0.20 SmAlO 3 ceramics sintered at 1450°C for 4h.