New microwave dielectric material for application in mobile communication

In this study, the microwave dielectric properties of La_2.98/3Ba_0.01(Mg_0.5Sn_0.5)O₃ ceramics prepared by the conventional solid-state method have been investigated for application in mobile communication. B₂O₃ was selected as a liquid sintering aid to lower the sintering temperature of La_2.98/3Ba_0.01(Mg_0.5Sn_0.5)O₃ ceramics. It was found that the X-ray diffraction patterns of the La_2.98/3Ba_0.01(Mg_0.5Sn_0.5)O₃ ceramics exhibited no significant phase difference with 0.25 wt% B2O3 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_2.98/3Ba_0.01(Mg_0.5Sn_0.5)O₃ with 0.25 wt% B₂O₃ additive were sintered at 1400 °C for 4h. The temperature coefficient of resonant frequency ¿_f (-72 ppm/ °C) was measured for La_2.98/3Ba_0.01(Mg_0.5Sn_0.5)O₃ ceramics with 0.25 wt% B₂O₃ sintered at 1400 °C for 4 h.