Preparation and microwave dielectric properties of the BaO·(Sm1−xLax)2O3·5TiO2 ceramic system

The microwave dielectric properties of the BaO·(Sm1−xLax)2O3·5TiO2 ceramic system were studied for developing high quality microwave dielectric ceramics. In this system, the substitution of La for Sm is effective for dielectric constant εr, but not effective for Q value. We found high quality resonator materials which show high εr of 90.7, Q·f products of 8900 GHz and temperature coefficient of resonant frequency τf=4.2 ppm/°C at the composition of x=0.1.