Abstract
Due to the defects from Bi volatilization and Fe ion valence change during normal sintering (NS), the BiFeO3-BaTiO3 (BF-BT) ceramic is always accompanied by serious leakage current and deteriorated electrical performance, which impeded its further application. In this work, the two-step sintering (TSS) method was applied to the BF-BT ceramics preparation, and numerous microstructures of samples were observed and verified that it can decrease the sintering temperature from 1000 ℃ to 900 ℃ and enhance the relative density to above 96%. This reduced the defects and solved the issue of large leakage current, and the resistivity of TSS samples is an order of magnitude higher than NS samples and reaches the maximum among the already reported. Moreover, the experimental and theoretical results conclude that the TSS samples obtained a stronger intrinsic piezoelectric effect, which increased the strain from 0.13% to 0.19%. The TSS method displayed enormous potential for BF-BT preparation.
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