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, ε_r and tanδ were about 78.3 and 3 × 10^-3 respectively. When k=5, ε_r and tanδ were about 53 and 9 × 10^-4 respectively.