Phase evolution, microstructure and microwave dielectric properties of 2Li2O-AO-3WO3 (A=Mg, Zn) composite ceramics

摘要: Low-firing microwave dielectric ceramics with compositions of 2Li2O-AO-3WO3 (A=Mg, Zn) were prepared by the solid state reaction method. The sintering behavior, microstructure and properties investigated. bulk density, quality factor (Q × f) relative permittivity (e r ) firstly increased, reached a max value then decreased increasing temperature. 2Li2O-MgO-3WO3 shown low temperature (~700 °C) good Q × f 23,582 GHz, e 5.89 τ f −78 ppm/°C. 2Li2O-ZnO-3WO3 sintered at 675 °C also presented excellent Q × f = 21,706 GHz,  = 6.76  = −94 ppm/°C. Most importantly, illustrated chemical compatiblity silver powders, which indicate that they can be used to LTCC multilayer devices.