Microwave dielectric properties of Li2ZnTi3O8 ceramics doped with ZnO-B2O3-SiO2 glass

Li2ZnTi3O8 ceramics doped with ZnO-B2O3-SiO2 glass were prepared by the conventional solid-state ceramic route. The effects of the ZnO-B2O3-SiO2 glass on the sintering temperature, phase composition, microstructure and microwave dielectric properties of Li2ZnTi3O8 ceramics were investigated. The addition of ZBS glass can reduce the sintering temperature of Li2ZnTi3O8 ceramic from 1075 degrees C to 925 degrees C without obvious degradation of the microwave dielectric properties. Only a single phase Li2ZnTi3O8 with cubic spinel structure forms in Li2ZnTi3O8 ceramic with ZBS addition sintered at 925 degrees C. Typically, 0.75 wt.% ZBS-doped Li2ZnTi3O8 ceramic sintered at 925 degrees C can reach a maximum relative density of 95.9% and exhibits good microwave dielectric properties of epsilon(r)=25.61, Q x f=51,615 GHz and tau(f)= -11.78 ppm/degrees C, which is promising for LTCC applications. (c) 2012 Elsevier B.V. All rights reserved.