In this study, the microwave dielectric properties of La_(2.98/3)Ba_(0.01)(Mg_(0.5)Sn_(0.5))O_3 ceramics prepared by the conventional solid-state method have been investigated for application in mobile communication. B_2O_3 was selected as a liquid sintering aid to lower the sintering temperature of La_(2.98/3)Ba_(0.01)(Mg_(0.5)Sn_(0.5))O_3 ceramics. It was found that the X-ray diffraction patterns of the La_(2.98/3)Ba_(0.01)(Mg_(0.5)Sn_(0.5))O_3 ceramics exhibited no significant phase difference with 0.25 wt% B_2O_3 additive at different sintering temperatures from 1350 to 1550°C. The maximum values of the dielectric constant and the quality factor multiples resonant frequency (Q × f) can be obtained when the La_(2.98/3)Ba_(0.01)(Mg_(0.5)Sn_(0.5))O_3 with 0.25 wt% B_2O_3 additive were sintered at 1400°C for 4h. The temperature coefficient of resonant frequency τ_f (-72 ppm/°C) was measured for La_(2.98/3)Ba_(0.01)(Mg_(0.5)Sn_(0.5))O_3 ceramics with 0.25 wt% B_2O_3 sintered at 1400°C for 4 h.
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