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Defect-Mediated Room Temperature Ferromagnetism in Lead-Free Ferroelectric Na0.5Bi0.5TiO3 Materials

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Abstract

The injection of ferromagnetism properties to ferroelectric materials is a feasible strategy for integrating new functionalities to create next-generation electronic devices. In this study, Ni-doped lead-free ferroelectric Na0.5Bi0.5TiO3 materials were synthesized using the sol-gel method. The optical band gap was reduced from 3.12 eV to 2.23 eV for un-doped and 9 mol% Ni-doped Na0.5Bi0.5TiO3 materials, respectively, when Ni was substituted at the Ti site. The Ni-doped Na0.5Bi0.5TiO3 materials exhibited ferromagnetism at room temperature. The maximum magnetization was found to be 0.91 μB/Ni. Our work offers insight into the role of transition metals in room temperature ferromagnetism in lead-free ferroelectric materials for the creation of new types of green multiferroic materials.

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Acknowledgments

This research is funded by the Hanoi University of Science and Technology (HUST) under project number T2018-TĐ-201.

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Authors and Affiliations

  1. School of Engineering Physics, Hanoi University of Science and Technology, 1 Dai Co Viet road, Hanoi, Vietnam

    D. D. Dung, N. H. Linh, L. H. Bac, N. N. Trung, L.T. H. Thanh & D. V. Thiet

  2. Department of Chemistry, Thai Nguyen University of Education, 20 Luong Ngoc Quyen Street, Thai Nguyen, Vietnam

    N. Q. Dung

  3. CNRS, Institut Néel, F-38042 Grenoble, France and Univ. Grenoble Alpes, Institut Néel, F-38042, Grenoble, France

    N. B. Doan

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

    N. B. Doan & L. V. Cuong

  5. School of Electronics and Telecommunications, Hanoi University of Science and Technology, 1 Dai Co Viet road, Hanoi, Vietnam

    N. V. Duc

  6. Department of Physics, University of Ulsan, Ulsan, 680-749, Republic of Korea

    S. Cho

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  1. D. D. Dung
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Correspondence to D. D. Dung.

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Dung, D.D., Dung, N.Q., Doan, N.B. et al. Defect-Mediated Room Temperature Ferromagnetism in Lead-Free Ferroelectric Na0.5Bi0.5TiO3 Materials. J Supercond Nov Magn 33, 911–920 (2020). https://doi.org/10.1007/s10948-019-05399-9

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  • DOI: https://doi.org/10.1007/s10948-019-05399-9

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