Investigation of the microwave dielectric properties of Li₂ZnTi₅O₁₂ ceramics

Cubic-structured Li₂ZnTi₅O₁₂ ceramics were prepared by a conventional solid-state reaction method, and their characterization and microstructure were investigated, with the microwave dielectric properties of these ceramics being studied for the first time. The relationships between the sintering temperature and the microwave dielectric properties in Li₂ZnTi₅O₁₂ ceramics were also studied. The variation trend of the dielectric constant was in accordance with that of the apparent density. The Q × f and τ_f were correlated with the density (an extrinsic factor), FWHM (an intrinsic factor) and bond valence in these compositions, respectively. The new microwave dielectric material Li₂ZnTi₅O₁₂ ceramics sintered at 1260 °C for 4 h have a dielectric constant (ϵ_r) of ∼38.4, a Q × f of ∼54,300 GHz (f = 5.898 GHz), and a τ_f ∼ 82.9 ppm/°C, and thus they are a suitable candidate for use in microwave applications.