Effect of B2O3 addition on the microwave dielectric properties of Li2ZnTi3O8 ceramic

Li2ZnTi3O8 ceramics doped with B2O3 were prepared by the conventional solid-state reaction. The effects of B2O3 additions on the sintering characteristic, phase composition, microstructure and microwave dielectric properties of Li2ZnTi3O8 ceramics were investigated. The addition of B2O3 reduces the sintering temperature of the Li2ZnTi3O8 ceramic from 1075 °C to 925 °C. Only a single phase Li2ZnTi3O8 forms in the Li2ZnTi3O8 ceramic with less than 2.0 wt% B2O3 sintered at 925 °C. However, when the addition of B2O3 exceeds 2.0 wt%, the second phase Li2B4O7 appears in the Li2ZnTi3O8 ceramic. Li2ZnTi3O8 ceramic doped with 1.5 wt% B2O3 addition sintered at 925 °C reaches a maximum relative density of 94.5 % and exhibits good microwave dielectric properties of εr = 24.96, Q×f = 49,600 GHz and τf = −11.3 ppm/°C.