Microwave dielectric properties of low-fired Li2ZnTi3O8–TiO2 composite ceramics with Li2WO4 addition

Abstract

The effects of Li2WO4 addition on phase composition, microstructure and dielectric properties of Li2ZnTi3O8–TiO2 (LZT) composite ceramics have been investigated. It was found that a small amount of LW additives could effectively lower the sintering temperature of LZT ceramics from 1,160 to 860 °C without a serious degradation of the microwave dielectric properties. Dense Li2WO4-doped LZT samples of a relative sintered density over 96 % could be prepared even at 840 °C. With increasing Li2WO4 addition up to 4 wt%, both of the er and τ f were slightly decreased, while the Q × f was increased firstly, then reached the maximum, and finally declined with the additive further increased. Typically, 2.0 wt% Li2WO4 added LZT ceramic sintered at 860 °C for 4 h exhibited good microwave dielectric properties of er = 27.1, Q × f = 51,123 GHz and τ f = −3.8 ppm/°C, which made it promising for low temperature co-fired ceramics technology application.