EFFECTS OF V2O5 ADDITION ON MICROWAVE DIELECTRIC PROPERTIES OF 16CaO-9Li2O-12Sm2O3-63TiO2 CERAMICS

Effects of V2O5 addition on the microwave dielectric properties of 16CaO-9Li2O-12Sm2O3-63TiO2 (abbreviated CLST) ceramics prepared by conventional mixed oxides method were investigated as a function of V2O5 content and sintering temperature. All the specimens were sintered between 1100°C and 1250°C. The sintering temperature of the CLST ceramics was lowered by 100°C with V2O5 addition. With the changing content of V2O5, the dielectric constants lie between 88.6 and 108.2, while the Q×f values are between 3275 and 6573 GHz. Especially, the specimens doped by 0.75 wt% V2O5 sintered at 1200°C and 1250°C for 3 h show good microwave dielectric properties with Kr=100.4-108.2, Q×f>4500GHz, and TCF=7-8 ppm/°C. Obviously, V2O5 could be used as a suitable sintering aid that could improve densification and microwave dielectric properties of the CLST ceramics.