Structure, ferroelectric, piezoelectric and ferromagnetic properties of BiFeO3–Ba0.6(Bi0.5K0.5)0.4TiO3 lead-free multiferroic ceramics
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Abstract
(1−x)BiFeO3–xBa0.6(Bi0.5K0.5)0.4TiO3 + 1 mol% MnO2 lead-free multiferroic ceramics were fabricated by a conventional ceramic technique and the effects of Ba0.6(Bi0.5K0.5)0.4TiO3 doping and sintering temperature on the microstructure, ferroelectric, piezoelectric and ferromagnetic properties of the ceramics were studied. All the ceramics show good electric insulation with the resistivity values of 1.97 × 109–1.20 × 1010 Ω cm. After the addition of Ba0.6(Bi0.5K0.5)0.4TiO3, two dielectric anomalies are observed at high temperatures (T 1 ~ 453–710 °C and T 2 ~ 716–755 °C, respectively). The ceramic with x = 0.275 exhibits the optimum piezoelectricity (d 33 = 48 pC/N and k p = 13.6 %, respectively). The Ba0.6(Bi0.5K0.5)0.4TiO3 doping and the increasing in sintering temperature improve significantly the ferromagnetic properties of the ceramics. The ceramic with x = 0.25 sintered at 1,040 °C gives the optimum remnant magnetization M r of 0.13 emu/g.
Keywords
MnO2 BaTiO3 Sinter Temperature BiFeO3 Tetragonal SymmetryNotes
Acknowledgments
This work was supported by the projects of Education Department of Sichuan Province (11ZA104 and 11ZA105) and Sichuan Normal University Graduate Dissertation Cultivation Fund (No. XYZ2013-14-38), 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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