Microwave Dielectric Properties of Li2TiO3 Ceramics Doped with ZnO-B2O3 Frit

A type of new low sintering temperature ceramic, Li2TiO3 ceramic, has been found. Although it is difficult for the Li2TiO3 compound to be sintered compactly at temperatures above 1000 degrees C for the volatilization of Li2O, dense Li2TiO3 ceramics were obtained by conventional solid-state reaction method at the sintering temperature of 900 degrees C with the addition of ZnO-B2O3 frit. The sintering behavior and microwave dielectric properties of Li2TiO3 ceramics with less ZnO-B2O3 frit (<= 3.0 wt%) doping were investigated. The addition of ZnO-B2O3 frit can lower the sintering temperature of the Li2TiO3 ceramics, but it does not apparently degrade the microwave dielectric properties of the Li2TiO3 ceramics. Typically, the good microwave dielectric properties of epsilon(r)=23.06, Q x f=32 275 GHz, tau(f)=35.79 ppm/degrees C were obtained for 2.5 wt% ZnO-B2O3 frit-doped Li2TiO3 ceramics sintered at 900 degrees C for 2 h. The porosity was 0.08%. The Li2TiO3 ceramic system may be a promising candidate for low-temperature cofired ceramics applications.