Crystal structure and dielectric properties of xCa(Mg1/3Nb2/3)O3–(1 − x)(Ca0.61Nd0.26)TiO3 at the microwave frequency

The microwave dielectric properties of the xCa(Mg1/3Nb2/3)O3–(1 − x)Ca0.61Nd0.26TiO3 ceramic system (x = 0.2, 0.4, 0.6, and 0.8) were investigated. The crystal structures and the microstructures of the ceramics were characterized using X-ray diffraction and scanning electron microscopy analyses, respectively. A near-zero temperature coefficient of resonant frequency was achieved by adjusting the x value of the system. When the x value was increased from 0.2 to 0.8, the dielectric constant ϵr decreased from 83 to 34, the quality factor value (Q × f) increased from 13,000 to 45,000 GHz, and the temperature coefficient of resonant frequency (τr) decreased from 85 to −21 ppm/°C. The 0.6Ca(Mg1/3Nb2/3)O3–0.4Ca0.61Nd0.26TiO3 ceramic system is suitable for microwave dielectric resonator applications, as it has an ϵr value of ∼47, a Q × f value of ∼37,000 GHz, and a τr value of ∼5 ppm/°C.