A Study of the Effect of Sintering Conditions of Mg(0.95)Ni(0.05)Ti(3) on Its Physical and Dielectric Properties

Mg(0.95)Ni(0.05)TiO(3) 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 (ε(r)) and Q factor (Q(f)) 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 (τ(f)) 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 (ε(r)) of 17.35 and a temperature coefficient (τ(f)) 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.), Mg(0.95)Ni(0.05)TiO(3) is considered to be a suitable candidate for substrate materials.