Effect of V2O5 additive to 0.4SrTiO3–0.6La(Mg0.5Ti0.5)O3 ceramics on sintering behavior and microwave dielectric properties

The effect of V2O5 addition on the microwave dielectric properties and the microstructures of 0.4SrTiO3–0.6La(Mg0.5Ti0.5)O3 ceramics sintered for 5 h at different sintering temperature were investigated systematically. It was found that the sintering temperature was effectively lowered about 200 °C by increasing V2O5 addition content. The grain sizes, bulk density as well as microwave dielectric properties were greatly dependent on sintering temperature and V2O5 content. The 4ST–6LMT ceramics with 0.25% V2O5 sintered at 1400 °C for 5 h in air exhibited optimum microwave dielectric properties of ɛr = 50.7, Q × f = 15049.6 GHz, Tf = −1.7 ppm/°C.