Microwave dielectric properties of Ca[(Li_1/3Nb _2/3)_1-x Ti_x]O_3-δ ceramics with glass

The effect of the addition of glass on the densification, low temperature sintering, and microwave dielectric properties of the Ca[(Li _1/3Nb_2/3)_1-x Ti_x]O _3-δ(CLNT) was investigated. Addition of glass (B ₂O₃-ZnO-SiO₂-PbO system) improved the densification and reduced the sintering temperature from 1150°C to 900°C of Ca[(Li_1/3Nb_2/3)_1-x -Ti_x]O _3-δ microwave dielectric ceramics. As increasing glass contents from 10 wt% to 15 wt%, the dielectric constants (ε_r) and bulk density were increased. The quality factor (Q•f₀), however, was decreased slightly. The temperature coefficients of the resonant frequency (τ_f) shifted positive value as increasing glass contents over Ti content is 0.2 mol. The dielectric properties of Ca[(Li_1/3Nb _2/3)_0.75Ti_0.25]O_3-δ with 10 wt% glass sintered at 900°C for 3 h were ε_r = 40 Q•f₀ = 11500 GHz, τ_f = 8, ppm/°C. The relationship between the microstructure and dielectric properties of ceramics was studied by X-ray diffraction (XRD), and scanning electron microscope (SEM).