Microwave dielectric properties of low-fired Li2TiO3 ceramics doped with Li2O–MgO–B2O3 frit

Abstract The effects of Li 2 O–MgO–B 2 O 3 (LMB) frit on the sintering characteristic, phase purity, microstructure and microwave dielectric properties of Li 2 TiO 3 ceramics were investigated. The results show that a single-phase Li 2 TiO 3 is formed and no secondary phase is formed. Addition of LMB frit can lower the sintering temperature of the ceramics by about 400 °C without deteriorating the microwave dielectric properties. Typically, the sample with 5 wt% LMB frit sintered at 850 °C shows good microwave dielectric properties with a permittivity of 21.4, a Q × f value of 64,100 GHz, and a temperature coefficient of resonant frequency of 26.9 ppm/°C.