Sintering behavior,phase structure and microwave dielectric properties of CeO2 added CaTiO3-SmAlO3 ceramics prepared by reaction sintering method

Novel 0.695CaTiO₃-0.305SmAlO₃+xwt% CeO₂ (x = 0, 0.5, 1.0, 1.5) ceramics were fabricated using a reaction-sintering (RS) approach. The crystal structure, morphology, and microwave dielectric properties of ceramics were systematically studied. The addition of CeO₂ could effectively improve the sintering behavior of 0.695CaTiO₃-0.305SmAlO₃ (CTSA) ceramics. When x = 0.5 wt%, the ceramics exhibited optimal microwave dielectric properties, with ε_r = 43.9, Q×f = 48 779 GHz, and τ_? = ?0.24 ppm/°C, thereby indicating that the samples prepared via the RS route possess superior dielectric properties compared to those prepared by the conventional solid phase reaction. The results demonstrate that CaTiO₃-SmAlO₃ ceramics can be prepared simply and efficiently through a reaction-sintering process.