Abstract
Low firing temperature 0.2Ca0.8Sr0.2TiO3–0.8Li0.5Sm0.5TiO3 (CST–LST) ceramics by BaCu (B2O5) addition and TiO2 dopant were prepared via the conventional solid-state ceramic route, and the sintering, phase evolution, microstructure, and dielectric properties were investigated. Addition of BaCu (B2O5) lowered the firing temperature about 300°C. The CST–LST ceramics with 5wt% BaCu(B2O5) sintered at 950°C exhibited single phase perovskite structure, together with the optimum microwave dielectric properties of ϵr=66.7, Q×f=3222GHz, τf=−21.3ppm/°C. Adding TiO2 improved the microwave properties. Typically, the CST–LST+5wt% BaCu(B2O5)+1.5wt% TiO2 sintered at 950°C showed ϵr=71.6, Q×f=3441GHz, τf=−10.8ppm/°C. The high permittivity and low temperatures of the ceramics were ideal for the development of low cost ultra-small dielectric loaded antenna. Compatibility with Ag electrode indicated that this material was suitable for low temperature co-fired ceramics.
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