Effect of ZnO–WO3 additives on sintering behavior and microwave dielectric properties of 0.95MgTiO3–0.05CaTiO3 ceramics

The effect of WO3 addition on the phase formation, the microstructures and the microwave dielectric properties of 1 wt% ZnO doped 0.95MgTiO3–0.05CaTiO3 ceramics system were investigated. Formation of second phase MgTi2O5 could be effectively restrained through the addition of WO3, but should be in right amount. WO3 as additives could not only effectively lower the sintering temperature of the ceramics to 1310 °C, but also promote the densification. A dielectric constant εr of 20.02, a Q×f value of 62,000 (at 7 GHz), and a τf value of −5.1 ppm/°C were obtained for 1 wt% ZnO doped 0.95MgTiO3–0.05CaTiO3 ceramics with 0.5 wt% WO3 addition sintered at 1310 °C.