Effects of sintering temperature and Ca substitution on microwave dielectric properties of Mg3V2O8

Effects of Ca substitution for Mg on the phase composition, microstructure, sintering behavior and microwave dielectric properties of Mg3-xCaxV2O8 ceramics were investigated. Mg3-xCaxV2O8 ceramics could be well densified at around 950 degrees C using a solid-state reaction method. The crystal structure and microwave dielectric properties exhibited strong dependence on the composition. A relatively temperature-stable composite ceramic was obtained at x = 9/4 with epsilon(r) similar to 12, Q x f similar to 5700 GHz, and tau(f) similar to -15 ppm/degrees C.