Electrical and conductivity performances of secondary phase in 0–3 type bismuth ferrate–based composite ceramics

Abstract

AbstractThe composite design strategy for ferro‐piezoelectric ceramics has been successfully used to get excellent performances, whereas few studies focus on the electrochemical characteristics of the second phase in the composite. In this work, MgO, due to its high resistance insulation and high breakdown strength, was selected to be compounded with 0.7BiFeO3–0.3BaTiO3 (BFBT) ceramics. Intriguingly, an unreported second phase was derived from the solid‐state reaction and identifying its chemical composition as about Mg13Ti3Fe24O55. AC impedance technique was applied to clarify the electrical contribution of the second phase in composites. The results show that it has higher resistivity at the high‐temperature stage and more stable capacitance with temperature. Moreover, the second phase can improve the overall dielectric‐temperature stability. Ultimately, it indicates composite strategy can bring some beneficial effects on BFBT ceramics, and this present work may provide an alternative route for separating the electrical contribution of different regions for composite ceramics.