Microwave dielectric properties of Li2ZnTi3O8 ceramics doped with Bi2O3

The effects of Bi2O3 on the sintering temperature, phase composition, microstructure and microwave dielectric properties of Li2ZnTi3O8 ceramics are investigated. The addition of Bi2O3 can effectively reduce the sintering temperature of Li2ZnTi3O8 ceramic from 1075 to 950 °C. Only a single phase Li2ZnTi3O8 forms in the Li2ZnTi3O8 ceramic with less than 1.0 wt% Bi2O3 addition sintered at 950 °C. However, when the addition of Bi2O3 exceeds 1.0 wt%, the second phase Bi2Ti2O7 forms in the Li2ZnTi3O8 ceramics. Typically, 2.0 wt% Bi2O3-doped Li2ZnTi3O8 ceramic sintered at 950 °C can reach a maximum relative density of 97.4% and exhibits good microwave dielectric properties of εr =27.8, Q×f=36386 GHz, τf=−19.5 ppm/°C.