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, micro-structures 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 °C), and the sintered ceramics with the major phase of Y2Ti2O7 had excellent dielectric properties. When k = 4, ɛr and tanδ were about 78.3 and 3 × 10−3 respectively. When k=5, ɛr and tanδ were about 53 and 9 × 10−4 respectively.