Low-temperature sintering and microwave dielectric properties of Ca5Co4(VO4)6 ceramics

A novel low temperature firing high Q microwave dielectric ceramic Ca5Co4(VO4)6 was prepared by the conventional solid-state reaction method. The phase purity, microstructure, and microwave dielectric properties were investigated. The Ca5Co4(VO4)6 ceramic sintered at 875 °C exhibited excellent microwave dielectric properties: Qxf = 95,200 GHz (at 10.6 GHz), τf = −63 ppm/°C, ɛr = 10.1, and its ɛr corrected for porosity was calculated as 11.1.