New material properties and microstructure of xLa(Mg_1/2Ti_1/2)O₃–(1-x)Ca_0.6Sm_0.8/3TiO₃ ceramics at microwave frequency

抄録

The microstructure and microwave dielectric properties of xLa(Mg_1/2Ti_1/2)O₃–(1-x)Ca_0.6Sm_0.8/3TiO₃ ceramics system with B₂O₃ additions (1 wt %) prepared by the conventional solid state route were investigated. Doping with B₂O₃ (1 wt %) can effectively promote the densification and the dielectric properties of xLa(Mg_1/2Ti_1/2)O₃–(1-x)Ca_0.6Sm_0.8/3TiO₃ ceramics. 0.5La(Mg_1/2Ti_1/2)O₃–0.5Ca_0.6Sm_0.8/3TiO₃ ceramics with 1 wt % B₂O₃ addition possesses a dielectric constant (ε_r) of 48, a Q×f value of 35,000 GHz (at 8 GHz) and a temperature coefficients of resonant frequency (τ_f) of 9.1 ppm/°C sintering at 1450°C.