Low-temperature firing and microwave dielectric properties of MgTiO3 ceramics with Bi2O3–V2O5

The effects of Bi2O3–V2O5 additive on the microstructures, the phase formation and the microwave dielectric properties of MgTiO3 Ceramics were investigated. The Bi2O3–V2O5 addition lowered the sintering temperature of MgTiO3 ceramics effectively from 1400 to 875 °C due to the liquid-phase effect. The microwave dielectric properties were found to strongly correlate with the amount of Bi2O3–V2O5 addition. The saturated dielectric constant decreased and the maximum Qf values increased with the increasing V2O5 content, which is attributed to the variation of the second phase including Bi2Ti2O7, Bi4V1.5Ti0.5O10.85 and BiVO4. At 875 °C, MgTiO3 ceramics with 5.0 mol% Bi2O3–7 mol% V2O5 gave excellent microwave dielectric properties: εr = 20.6,Qf = 10420 GHz (6.3 GHz).