Synthesis and microwave dielectric properties of Li2MgTiO4 ceramics

Rock-salt-structured Li2MgTiO4 ceramic was prepared by the conventional solid-state route, and sintered at 1200–1300 °C for 5 h. The sintering behavior, microstructures and microwave dielectric properties of the Li2MgTiO4 ceramic have been investigated. The structure and microstructure were analyzed by using X-ray diffraction and scanning electron microscopy techniques. The secondary phases of Mg2TiO4 and Li2Mg3Ti4O12 were produced, when sintering temperatures exceeded 1250 °C. The dielectric properties of the Li2MgTiO4 ceramic exhibited a significant dependence on the densification and secondary phases. The Li2MgTiO4 ceramics sintered at 1250 °C showed good microwave dielectric properties: εr=15.7, Q×f=91,000 (at 8.1 GHz), and τf=−28 ppm/°C.