Dielectric and Piezoelectric Properties in Mn‐Modified (1−<i>x</i>)BiFeO<sub>3</sub>–<i>x</i>BaTiO<sub>3</sub> Ceramics

Journal of the American Ceramic Society - Tập 92 Số 12 - Trang 2957-2961 - 2009
S. O. Leontsev1, Richard E. Eitel1
1Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506

Tóm tắt

In the current work, the bulk (1−x)BiFeO3–xBaTiO3 system has been studied as a potential lead‐free piezoelectric material. Barium titanate (BaTiO3) in solid solution with bismuth ferrite (BiFeO3) is observed to stabilize the perovskite structure and improve switching behavior. Samples with various content of BaTiO3 were prepared via solid‐state route, and pure perovskite phase was confirmed by X‐ray diffraction. Modification of the BaTiO3–BiFeO3 material with Mn improved DC resistivity by one to five orders of magnitude (7.6 × 1012 vs. 2.7 × 107Ω·m for 25 mol% BaTiO3 at room temperature) and polarization hysteresis measurements indicated “hard” ferroelectric behavior with the highest strain response at 33 mol% BaTiO3. Finally, low‐field piezoelectric d33 coefficient of 116 pC/N and ferroelectric transition temperature above 450°C are reported for 25 mol% BaTiO3 composition.

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Thông tin xuất bản

Journal of the American Ceramic Society

Tập 92 Số 12

2957-2961

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