A Study of the Effect of Sintering Conditions of Mg0.95 Ni0.05 Ti3 on Its Physical and Dielectric Properties

Mg0.95 Ni0.05 TiO3 ceramics were prepared by traditional solid-state route using sintering temperatures between 1300 and 1425◦ C and holding time of 2–8 h. The sintered samples were characterized for their phase composition, micro-crystalline structure, unit–cell constant, and dielectric properties. A two-phase combination region was identified over the entire compositional range. The effect of sintering conditions was analyzed for various properties. Both permittivity (εr ) and Q factor (Qf ) were sensitive to sintering temperatures and holding times, and the optimum performance was found at 1350◦ C withholding time of 4 h. The temperature coefficient of resonant frequency (τf ) in a range from −45.2 to −52 (ppm/◦ C) and unit–cell constant were not sensitive to both the sintering temperature and holding time. An optimized Q factor of 192,000 (GHz) related with a permittivity (εr ) of 17.35 and a temperature coefficient (τf ) of −47 (ppm/◦ C) was realized for the specimen sintered at 1350◦ C withholding time of 4 h. For applications of 5G communication device (filter, antennas, etc.), Mg0.95 Ni0.05 TiO3 is considered to be a suitable candidate for substrate materials.