Microwave dielectric properties of high quality factor La(Mg0.5−xCaxSn0.5)O3 ceramics

The microwave dielectric properties of La(Mg0.5−xCaxSn0.5)O3 ceramics were examined with a view to their exploitation for wireless communications. The La(Mg0.5−xCaxSn0.5)O3 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The La(Mg0.5−xCaxSn0.5)O3 ceramics contained Ca2SnO4, CaSnO3, and La2O3. The amount of Ca2SnO4 increased with increasing sintering temperature. However, the relative amount of CaSnO3 decreased with increasing sintering temperature. An apparent density of 6.52 g/cm3, a dielectric constant (εr) of 20.2, a quality factor (Q×f) of 80,500 GHz, and a temperature coefficient of resonant frequency (τf) of −79 ppm/°C were obtained for La(Mg0.4Ca0.1Sn0.5)O3 ceramics that were sintered at 1500 °C for 4 h.

► La(Mg0.4Ca0.1Sn0.5)O3 had a dielectric constant of 20.2.
► La(Mg0.4Ca0.1Sn0.5)O3 had a quality factor of 80,500 GHz.
► La(Mg0.4Ca0.1Sn0.5)O3 had a τf of −79 ppm/°C.