The dielectric properties and the microstructures of xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics with B2O3 additions (0.25wt%) prepared with conventional solid-state route have been investigated. Doping with B2O3 (0.25wt%) can effectively promote the densification and the dielectric properties of xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics. It is found that xLa(Mg1/2Ti1/2)O3−(1−x)CaTiO3 ceramics can be sintered at 1400°C due to the liquid phase effect of B2O3 addition observed by Scanning Electronic Microscopy. At 1425°C, 0.5La(Mg1/2Ti1/2)O3−0.5CaTiO3 ceramics with 0.25 wt% B2O3 addition possesses a dielectric constant (εr) of 43, a Q×f value of 24470 (at 8GHz) and a temperature coefficients of resonant frequency (τf) of -8.94 ppm/°C. As an increasing the content of La(Mg1/2Ti1/2)O3, the highest Q×f value of 30824(GHz) could be achieved for X=0.7.
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