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

The effect of Li 2 O-Al 2 O 3 -B 2 O 3 (LAB) glass addition on phase composition, microstructure and the microwave dielectric properties of Li 2 ZnTi 3 O 8 ceramics with TiO 2 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% TiO 2 on Li 2 ZnTi 3 O 8 ceramics, the temperature coefficient of the resonant frequency ( τ ƒ ) value could be adjusted to +3.3 ppm/°C. When a small amount of LAB glass was added to the Li 2 ZnTi 3 O 8 + 17 mol% TiO 2 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 Li 2 ZnTi 3 O 8 + 17 mol% TiO 2 ceramics sintered at 900°C for 4 h had good microwave dielectric properties with ε r = 26.8, Q × f = 28,000 GHz and τ ƒ = + 2.5 ppm/°C, which made it a promising ceramic for LTCC technology application.