Low temperature sintering and dielectric properties of Li2ZnTi3O8–TiO2 composite ceramics doped with CaO–B2O3–SiO2 glass

Abstract

The effects of CaO–B2O3–SiO2 (CBS) glass addition on the sintering temperature and dielectric properties of Li2ZnTi3O8–TiO2 (LZT) composite ceramics have been investigated. Due to the compensating effect of rutile TiO2 (τf ≈ +450 ppm/ °C), the temperature coefficient of resonant frequency (τf) for Li2ZnTi3O8 + 4 wt% TiO2 with biphasic structure was adjusted to a value near zero. The pure LZT ceramics were usually sintered at high temperature of about 1,160 °C. It was found in our experiment that a small amount of CBS glass additives could effectively lower the sintering temperature of LZT ceramics to 900 °C. With increasing the content of CBS glass, both of dielectric constant (er) and quality factor (Q × f) value decreased. Typically, the 1 wt% CBS glass added Li2ZnTi3O8 + 4 wt% TiO2 ceramic sintered at 900 °C for 4 h exhibited good microwave dielectric properties of er = 26.9, Q × f = 23,563 GHz and τf = −1.5 ppm/ °C, which made it promising for low temperature co-fired ceramics technology application.