Influence of V2O5 additions to 0.8(Mg0.95Zn0.05)TiO3–0.2Ca0.61Nd0.26TiO3 ceramics on sintering behavior and microwave dielectric properties

The effects of additive sintering aids on the microstructures and microwave dielectric properties of 0.8(Mg0.95Zn0.05)TiO3–0.2Ca0.61Nd0.26TiO3 ceramics were investigated. V2O5 was selected as a liquid phase sintering aid to lower the sintering temperature of 0.8(Mg0.95Zn0.05)TiO3–0.2Ca0.61Nd0.26TiO3 ceramics. With added V2O5, the densification temperature of 0.8(Mg0.95Zn0.05)TiO3–0.2Ca0.61Nd0.26TiO3 can be effectively reduced from 1350 °C to 1175–1275 °C. Low-level doping of V2O5 (0.5–4 wt%) significantly improves the density and dielectric properties of 0.8(Mg0.95Zn0.05)TiO3–0.2Ca0.61Nd0.26TiO3 ceramics. The quality factor Q × f was strongly dependent upon the amount of additives. Q × f values of 46,100 and 14,700 GHz could be obtained at 1175–1275 °C with 0.5 and 4 wt% V2O5 added, respectively. Over all ranges of addition, the relative dielectric constants differed significantly and ranged from 20.6 to 26.5. The temperature coefficient varied from −14.9 to 8.91 ppm/ °C.