Abstract
The 0.65CaTiO3–0.35SmAlO3 (CTSA) ceramics were synthesized by the conventional solid-state reaction technique. The effects of ZrO2–ZnO additives on the phase compositions, densification, sintering temperature and microwave dielectric properties were investigated. It has been found that a perovskite phase is the main phase and a second phase CaZrTi2O7 appeared as ZrO2 content increasing to 1 wt % in CTSA ceramics. The appropriate ZrO2 and ZnO additions could not only effectively lower the sintering temperature of CTSA ceramics to 1340 °C, but also promote the densification and microwave dielectric properties. But excessive additives deteriorated the microstructures and comprehensive properties of samples. Typically, excellent microwave dielectric properties: er = 44.65, Q × f = 38,600 GHz (at 5.0 GHz) and τf = −8.36 ppm/°C were obtained for CTSA ceramics sintered at 1340 °C doped with 0.5 wt% ZrO2 and 1 wt% ZnO.
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