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

Abstract The effect of WO 3 addition on the phase formation, the microstructures and the microwave dielectric properties of 1 wt% ZnO doped 0.95MgTiO 3 –0.05CaTiO 3 ceramics system were investigated. Formation of second phase MgTi 2 O 5 could be effectively restrained through the addition of WO 3 , but should be in right amount. WO 3 as additives could not only effectively lower the sintering temperature of the ceramics to 1310 °C, but also promote the densification. A dielectric constant e r of 20.02, a Q × f value of 62,000 (at 7 GHz), and a τ f value of −5.1 ppm/°C were obtained for 1 wt% ZnO doped 0.95MgTiO 3 –0.05CaTiO 3 ceramics with 0.5 wt% WO 3 addition sintered at 1310 °C.