Influence of Zn-Al Codoping on Dielectric Properties of 0.95MgTiO_3-0.05CaTiO_3 Ceramics

The dielectric properties of(Mg0.95Ca0.05Zn0.02)(Ti1-xAlx)O3 ceramics prepared by conventional solid-state route were investigated.The results show that MgTiO3 and CaTiO3 are the main phases of 95MCT ceramics with codoped Zn-Al,without second phase MgTi2O5 is observed but a new phase CaAl2O4.Zn-Al additive can lower the sintering temperature of 95MCT ceramics to 1300℃,and improve the dielectric properties.Moreover,it also effectively adjusts the temperature coefficient of dielectric constant.The 95MCT ceramics with x=0.02 possess excellent dielectric properties: dielectric constant er of 20.35,dielectric loss tgδ of 2.0×10-6 and temperature coefficient of dielectric constant αc value of-1.78×10-6.