The influence of AST doping on the dielectric properties of MgTiO3-based ceramics fabricated by solid-state sintering

AST-doped ZnO-MgTiO3-SrTiO3 ceramics were prepared using a solid-state sintering process. The effects of AST (Al2O3-SiO2-TiO2) on the dielectric properties of MgTiO3-based ceramics were investigated. The results indicate that AST-doped MgTiO3-based ceramics could be obtained after 1205 similar to 1280 degrees C sintering for 3 h. The XRD results indicate that the obtained MgTiO3-based ceramics contain high percentage of MgTi2O5 phase and the percentage increased with the increase of AST content. It was found that the occurred liquid-phase sintering by adding AST glass could effectively lower the sintering temperature and decrease the dielectric loss of MgTiO3-based ceramics. A minimum tan delta of 1.5 x 10(-4) associated with epsilon(r)=19.0 was achieved for 6.0 wt% AST-doped samples sintered at 1255 degrees C.