Microwave dielectric properties and chemical compatibility with silver electrode of Li2TiO3 ceramic with Li2O–ZnO–B2O3 glass additive

Abstract

The effects of Li2O–ZnO–B2O3 (LZB) glass additive on the sintering behavior, phase composition, microstructure and microwave dielectric properties of Li2TiO3 (LT) ceramics have been investigated. The addition of a small amount of LZB glass can reduce the sintering temperature of LT ceramics from 1150°C to 900°C without obvious degradation of the microwave dielectric properties. Only a single-phase Li2TiO3 is formed in LT ceramic with LZB glass addition sintered at 900°C for 2h. Typically, the 2.5wt% LZB glass-added LT ceramic sintered at 900°C for 2h can reach a maximum relative density of 94.8% of the theoretical density and exhibits good microwave dielectric properties of εr=22.9, Qf=59,600GHz and τf=+23.7ppm/°C. The XRD, SEM and EDX analyses showed that the ceramic can be co-fired well with Ag electrode, which may be applied for LTCC application.