Studies on BaO-Y2O3-TiO2 Microwave Dielectric Ceramics

BaO-Y2O3-TiO2 microwave dielectric ceramics with the rich area of TiO2 were fabricated by a solid-state reaction method using BaCO3, Y2O3, TiO2 powders as starting materials. The sintering characteristics, phase composition, microstructures and microwave dielectric properties of BaO-Y2O3-TiO2 microwave dielectric ceramics with different k values sintered at different temperatures were investigated. The results showed that the sintering temperature of BaO-Y2O3-TiO2 microwave dielectric ceramics was lower (about 1240 degrees C), and the sintered ceramics with the major phase of Y2Ti2O7 had excellent dielectric properties. When k = 4, epsilon(r) and tan delta were about 78.3 and 3 x 10(-3) respectively. When k = 5, epsilon(r) and tan delta were about 53 and 9 x 10(-4) respectively.