Effects of La2O3-B2O3-ZnO additions on the low temperature sintering and microwave dielectric properties of (Ca_(0.61)La_(0.26)) TiO3 ceramics

摘要

The influence of La2O3-B2O3-ZnO (LBZ) additions on the sintering behavior, microstructure, phase composition, and the microwave dielectric properties of (Ca_(0.61)La_(0.26)) TiO3 (CLT) ceramics have been investigated. The results indicate that the LBZ additions could efficiently lower the sintering temperature of the CLT ceramics from 1400°C to 950°C, and excellent microwave properties remain. Small amount of LBZ glass promotes the densification of the CLT ceramics and enhances the microwave dielectric properties. However, excess amount of LBZ glass deteriorates the dielectric properties because of the increasing glass phase. The CLT ceramic with 3 wt. % LBZ additions, sintered at 950°C, exhibit excellent properties: ε_r= 103.12, Qx f = 8826 GHz(f=3.312 GHz) and τ_f=299.52 ppm/°C.