Microwave Dielectric Properties of TiO2-Added Li2ZnTi3O8 Ceramics Doped with Li2O-Al2O3-B2O3 Glass

The effect of Li2O-Al2O3-B2O3 (LAB) glass addition on phase composition, microstructure and the microwave dielectric properties of Li2ZnTi3O8 ceramics with TiO2 were investigated using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS) and a vector network analyzer. With the addition of 17 mol% TiO2 on Li2ZnTi3O8 ceramics, the temperature coefficient of the resonant frequency (τƒ) value could be adjusted to +3.3 ppm/°C. When a small amount of LAB glass was added to the Li2ZnTi3O8 + 17 mol% TiO2 materials, the sintering temperature could be significantly lowered from 1160°C to 900°C. With increasing the LAB glass, the Q × f value first increased and then decreased. Typically, the 1 wt.% LAB glass-added Li2ZnTi3O8 + 17 mol% TiO2 ceramics sintered at 900°C for 4 h had good microwave dielectric properties with εr = 26.8, Q × f = 28,000 GHz and τƒ = + 2.5 ppm/°C, which made it a promising ceramic for LTCC technology application.