Characterization and microwave dielectric properties of new low loss Li2MgZrO4 ceramics

Low loss microwave dielectric materials Li2MgZrO4 were synthesized by solid-state route. The relationship among sintering characteristics, phase composition, microstructure and microwave dielectric properties of Li2MgZrO4 ceramics were firstly investigated using X-Ray Diffraction, Scanning Electron Microscopy and Network Analyzer. The formation of secondary phases and evaporation of lithium were observed when sintering temperatures exceeded 1175 °C. Microwave dielectric properties of Li2MgZrO4 ceramics were affected by sintering characteristics and second phase. In addition, the bond energy of Li2MgZrO4 ceramics was also reported to analyze intrinsic loss. Typically, the ceramics sintered at 1175 °C for 4 h exhibited excellent microwave dielectric properties with εr=12.30, Q·f =40,900 GHz and τf=−12.31 ppm/°C.