Microstructure and Microwave Dielectric Property of(1-x)(Sr_(0.2)Nd_(0.208)Ca_(0.488))TiO_3-xNd(Ti_(0.5)Mg_(0.5))O_3 Ceramics with High Quality Factor

(1-x)(Sr0.2Nd0.208Ca0.488)Ti O3-x Nd(Ti0.5Mg0.5)O3(0.3≤ x ≤0.4, SNCT-NTMx) ceramics were prepared by solid sate reaction technique. In addition, the crystal structure, microstructures, sintering properties, and microwave dielectric properties of the SNCT-NTMx ceramics were investigated. These results showed that an orthorhombic perovskite structure with a minor amount of unknown secondary phase was formed in the ceramics with the compositions of 0.3≤ x ≤0.35. Additionally, the content of the second phase gradually increased with increasing x value to 0.4. For the SNCT-NTMx ceramics with an increase in NTM content, the dielectric constant(er) decreased, while the quality factor(Q×f) effectively improved, and the temperature coefficient of resonant frequencies(τf) gradually shifted to negative direction. An optimized microwave dielectric properties with er ~ 50.1, Q×f ~ 44, 910 GHz and τf ~ –1.7×10-6/℃ could be obtained for the ceramics with x = 0.35 after being sintered at 1520℃ for 4 h.