Effect of ZnO-WO_3 additives on sintering behavior and microwave dielectric properties of 0.95MgTiO_3-0.05CaTiO_3 ceramics

摘要

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_2O_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 ε_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.