Abstract
(0.725 − x)BiFeO3–0.275BaTiO3–xBi(Mg0.5Zr0.5)O3 + 1 mol% MnO2 lead-free ceramics (x = 0–0.08) were synthesized by a conventional solid state reaction method and the effects of Bi(Mg0.5Zr0.5)O3 on phase transition, piezoelectric and ferroelectric properties of the ceramics were investigated. After the addition of Bi(Mg0.5Zr0.5)O3, the crystal structure of the ceramics is transformed from rhombohedral to tetragonal phase and the morphotropic phase boundary (MPB) of rhombohedral and tetragonal phase is formed at x = 0.01. The grain size of the ceramics increases with x increasing from 0 to 0.02 and then decreases with x further increasing. The dielectric peak of the ceramics becomes diffusive with x increasing after the addition of Bi(Mg0.5Zr0.5)O3. The ceramics with x = 0–0.08 exhibit much better electric insulation with the resistivity of 1.0 × 109–5.0 × 109 Ω·cm than pure BiFeO3 ceramic with the resistivity of ~5 × 107 Ω·cm. Due to the formation of the MPB, the ceramics with x = 0–0.02 possess good densification with the relative densities ρ r of 94.9–96.3 %, strong piezoelectricity with the d 33 of 129–135 pC/N and very high Curie temperature with the T C of 559–610 °C.
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This work was supported by the projects of Education Department of Sichuan Province (11ZA104), Science and Technology Bureau of Sichuan Province (2010JQ0046) and the Open Project of State Key Laboratory of Electronic Thin Films and Integrated Devices of University of Electronic Science and Technology of China (KFJJ201108).
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Luo, L., Jiang, N., Lei, F. et al. Phase transition, ferroelectric and piezoelectric properties of Bi(Mg0.5Zr0.5)O3-modified BiFeO3–BaTiO3 lead-free ceramics. J Mater Sci: Mater Electron 25, 1736–1744 (2014). https://doi.org/10.1007/s10854-014-1792-7
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DOI: https://doi.org/10.1007/s10854-014-1792-7