Dielectric properties of Mg0.95Ni0.05TiO3 ceramic modified by Nd0.5Na0.5TiO3 at microwave frequencies

The effect of Nd_0.5Na_0.5TiO₃ addition on the microwave dielectric properties of Mg_0.95Ni_0.05TiO₃ ceramics was investigated. The Nd_0.5Na_0.5TiO₃ content plays a significant role in improving the dielectric properties. Microwave dielectric measurements show an increase in the dielectric constant (ε_r) and temperature coefficient of the resonant frequency (τ_f) and a decrease in the quality factor (Q × f value) with increasing Nd_0.5Na_0.5TiO₃ content. By properly adjusting the Nd_0.5Na_0.5TiO₃ content, a zero τ_f value can also be obtained, which make Mg_0.95Ni_0.05TiO₃ a promising material in wireless systems. At 1300 °C, the 0.81Mg_0.95Ni_0.05TiO₃–0.19Nd_0.5Na_0.5TiO₃ ceramics possess excellent microwave dielectric properties: a dielectric constant (ε_r) of 25.61, a Q × f value of 69,100 GHz, and a τ_f value of −6 ppm/°C.