Effects of B‐site Substitution on Microwave Dielectric Properties of Ba6−3xNd8+2x [Ti1−z (Ni1/3Nb2/3)z] 18O54 Ceramics

According to the solid-state reaction, microwave dielectric ceramics of Ba6−3xNd8+2x[Ti1−z(Ni1/3Nb2/3)z]18O54 (x = 0.75, 0 ≤ z ≤ 0.2) were fabricated. Microwave dielectric properties, including relative dielectric constant (er), quality factor (Qf ), and temperature coefficient of resonant frequency (τf), were investigated as a function of substitution content. As z increasing from 0 to 0.2, dielectric constant was decreased from 87.3 to 80.4, Qf value declined from 9700 to 1200 GHz, and τf dropped from +60.0 to −27.0 ppm/°C. Appropriate substitution conducted excellent microwave dielectric properties with z = 0.05 sintered at 1375°C for 2 h in air: er = 82.25, Qf = 6100 GHz, and τf = +18 ppm/°C.