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Origin of Room Temperature Ferromagnetism in Cr-Doped Lead-Free Ferroelectric Bi0.5Na0.5TiO3 Materials

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Abstract

The development of multiferroic materials based on lead-free ferroelectric material provides an opportunity to fabricate next-generation electronic devices. In this work, Cr-doped lead-free ferroelectric Bi0.5Na0.5TiO3 materials were synthesized by using the sol–gel method. The optical band gap was reduced from 3.12 eV to 2.12 eV for undoped and 9 mol.% Cr-doped Bi0.5Na0.5TiO3 with the substitution of Cr at the Ti-site. Cr-doped Bi0.5Na0.5TiO3 materials exhibited weak ferromagnetism at room temperature. Saturation magnetization was approximately 0.08 μ B/Cr at 5 K. Our work will facilitate the further understanding of the role of transition metal ferromagnetism in lead-free ferroelectric materials at room temperature.

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Authors and Affiliations

  1. School of Engineering Physics, Ha Noi University of Science and Technology, 1 Dai Co Viet Road, Hanoi, Viet Nam

    L. T. H. Thanh, L. H. Bac & D. D. Dung

  2. Faculty of Physics, College of Science, Ha Noi National University, 334 Nguyen Trai Road, Hanoi, Viet Nam

    L. T. H. Thanh & P. Q. Bao

  3. CNRS, Institut Néel, 38042, Grenoble, France

    N. B. Doan

  4. Univ. Grenoble Alpes, Institut Néel, 38042, Grenoble, France

    N. B. Doan

  5. Faculty of Engineering Physics and Nanotechnology, University of Engineering and Technology, Vietnam National University, Building E3, 144 Xuan Thuy, Cau Giay, Hanoi, Viet Nam

    N. B. Doan & L. V. Cuong

  6. Department of Chemistry, Thai Nguyen University of Education, 20 Luong Ngoc Quyen Street, Thai Nguyen, Viet Nam

    N. Q. Dung

  7. Vietnam Maritime University, 48 Lach Tray Street, Ngo Quyen, Haiphong, Viet Nam

    N. A. Duc

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  1. L. T. H. Thanh
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  2. N. B. Doan
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  3. N. Q. Dung
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  4. L. V. Cuong
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  5. L. H. Bac
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  7. P. Q. Bao
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  8. D. D. Dung
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Correspondence to D. D. Dung.

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Thanh, L.T.H., Doan, N.B., Dung, N.Q. et al. Origin of Room Temperature Ferromagnetism in Cr-Doped Lead-Free Ferroelectric Bi0.5Na0.5TiO3 Materials. J. Electron. Mater. 46, 3367–3372 (2017). https://doi.org/10.1007/s11664-016-5248-0

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  • DOI: https://doi.org/10.1007/s11664-016-5248-0

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