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Phase transition, dielectric, ferroelectric and ferromagnetic properties of La-doped BiFeO3–BaTiO3 multiferroic ceramics

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Abstract

0.70Bi1−xLaxFeO3–0.30BaTiO3 + 1 mol% MnO2 multiferroic ceramics were prepared by using the solid state reaction and their phase structure, dielectric, ferroelectric and ferromagnetic properties were studied. All the ceramics possess perovskite structure and exhibit good insulation and densification. A morphotropic phase boundary of rhombohedral and tetragonal phases is formed at x = 0.02. As the concentration of La3+ is increased, the ferroelectric–paraelectric phase transition of the ceramics at Curie temperature becomes gradually more diffusive. A small amount of the substitution of La3+ for Bi3+ improves effectively the ferroelectricity of the ceramics and the optimum remanent polarization of 27.2 μm/cm2 reaches at x = 0.04. After the addition of La3+, the ferromagnetism of the ceramics is greatly enhanced and the remanent magnetization M r monotonously increases from 0.0321 to 0.147 emu/g with x increasing from 0 to 0.10. Our results show that the ceramics possess simultaneously improved ferroelectric and ferromagnetic properties and may a promising candidate for room-temperature multiferroic materials.

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Acknowledgments

This work was supported by the projects of Science and Technology Bureau of Sichuan Province (2010JQ0046), Sichuan Normal University 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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Authors and Affiliations

  1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China

    Xiaochun Wu, Mijie Tian, Yongquan Guo, Qiaoji Zheng, Lingling Luo & Dunmin Lin

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  1. Xiaochun Wu
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  2. Mijie Tian
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Correspondence to Dunmin Lin.

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Wu, X., Tian, M., Guo, Y. et al. Phase transition, dielectric, ferroelectric and ferromagnetic properties of La-doped BiFeO3–BaTiO3 multiferroic ceramics. J Mater Sci: Mater Electron 26, 978–984 (2015). https://doi.org/10.1007/s10854-014-2492-z

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