Low‐Temperature Sintering and Influence of the Process on the Dielectric Properties of Ba(Zn1/3Ta2/3)O3

Abstract

By controlling the granulometric distribution of the powders, a density of >96% of the theoretical density has been attained for Ba(Zn1/3Ta2/3)O3 that has been sintered at a low temperature (1450°C) for a short soaking time (2 h). Attrition milling produces a very fine and monomodal powder that allows for good densification. The attrition conditions result from a compromise between granulometric distribution and the risk of pollution. We have found a great influence of the origin of the raw materials on the temperature coefficient of frequency, allowing a modulation in the range of 0‐15 ppm/°C. Finally, we have studied the influence of each step of the process on the dielectric properties and identified the secondary phases that form with the evaporation of zinc: an eight‐layered hexagonal perovskite and a tetragonal tungsten‐bronze‐type phase.