Microwave dielectric properties of LiMVO4 (M=Mg, Zn) ceramics with low sintering temperatures

Abstract Microwave dielectric ceramics LiMVO 4 (M=Mg, Zn) were prepared by using the solid state reaction method. Microstructure and microwave dielectric properties of the ceramics were investigated. The LiMgVO 4 ceramic could be well densified at 675 °C for 2 h and exhibited good microwave dielectric properties with a relative permittivity of 9.1, a Q × f value of 33,730 GHz and τ f value of −160 ppm/°C. Meanwhile, the LiZnVO 4 ceramic sintered at 750 °C for 2 h with excellent microwave dielectric properties, i.e., a relative permittivity of 7.6, a Q × f value of 22,000 GHz and τ f value of −110 ppm/°C. X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) results indicated that very small part of LiMgVO 4 phase and LiZnVO 4 phase reacted with Ag. Furthermore, the (1− x )LiMVO 4 – x TiO 2 (M=Mg, Zn; x =0.20–0.45) ceramics could be sintered at low sintering temperatures (640–760 °C) for 2 h, with relative permittivities of 9.7–20.1, Q × f values of 20,100–39,200 GHz and near zero τ f values of −20 to 5 ppm/°C.