中国物理B ›› 2025, Vol. 34 ›› Issue (12): 127503-127503.doi: 10.1088/1674-1056/ade855

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NaBH4 induces strong ferromagnetism of Bi2Fe4O9 at room temperature

Chong Wang(王冲)1, Guorong Liu(刘国荣)1,†, Xiaofeng Sun(孙小峰)2, Jinyuan Ma(马金元)2, Tao Xian(县涛)3, and Hua Yang(杨华)1,2   

  1. 1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
    2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
    3 College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China
  • 收稿日期:2025-04-23 修回日期:2025-06-25 接受日期:2025-06-26 发布日期:2025-12-04
  • 通讯作者: Guorong Liu E-mail:liugr07@163.com
  • 基金资助:
    This work was supported by the Natural Science Foundation of Gansu Province of China (Grant No. 24JRRA171), the Postgraduate “Innovative Star” Project of Gansu Provincial Department of Education (Grant No. 2025CXZX-587), and the National Natural Science Foundation of China (Grant No. 52162040).

NaBH4 induces strong ferromagnetism of Bi2Fe4O9 at room temperature

Chong Wang(王冲)1, Guorong Liu(刘国荣)1,†, Xiaofeng Sun(孙小峰)2, Jinyuan Ma(马金元)2, Tao Xian(县涛)3, and Hua Yang(杨华)1,2   

  1. 1 School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
    2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
    3 College of Physics and Electronic Information Engineering, Qinghai Normal University, Xining 810008, China
  • Received:2025-04-23 Revised:2025-06-25 Accepted:2025-06-26 Published:2025-12-04
  • Contact: Guorong Liu E-mail:liugr07@163.com
  • Supported by:
    This work was supported by the Natural Science Foundation of Gansu Province of China (Grant No. 24JRRA171), the Postgraduate “Innovative Star” Project of Gansu Provincial Department of Education (Grant No. 2025CXZX-587), and the National Natural Science Foundation of China (Grant No. 52162040).

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摘要： Bi$_{2}$Fe$_{4}$O$_{9}$ nanosheets were prepared using a hydrothermal method, followed by the introduction of NaBH$_{4}$ and high-temperature calcination, which successfully induced strong ferromagnetism in the material at room temperature ($M_{\rm S} = 10.22$ emu/g and $M_{\rm r} = 2.93$ emu/g). This work demonstrates for the first time that Bi$_{2}$Fe$_{4}$O$_{9}$ can exhibit such strong ferromagnetism at room temperature, with potential for further enhancements. Meanwhile, the ferroelectric properties of the samples were investigated. X-ray diffraction confirmed that the samples were single-phase with no detectable impurities. Based on a series of characterization analyses, it is inferred that Bi vacancies contribute to the observed strong magnetism.

关键词: Bi$_{2}$Fe$_{4}$O$_{9}$, strong ferromagnetism, room temperature, NaBH$_{4}$

Abstract: Bi$_{2}$Fe$_{4}$O$_{9}$ nanosheets were prepared using a hydrothermal method, followed by the introduction of NaBH$_{4}$ and high-temperature calcination, which successfully induced strong ferromagnetism in the material at room temperature ($M_{\rm S} = 10.22$ emu/g and $M_{\rm r} = 2.93$ emu/g). This work demonstrates for the first time that Bi$_{2}$Fe$_{4}$O$_{9}$ can exhibit such strong ferromagnetism at room temperature, with potential for further enhancements. Meanwhile, the ferroelectric properties of the samples were investigated. X-ray diffraction confirmed that the samples were single-phase with no detectable impurities. Based on a series of characterization analyses, it is inferred that Bi vacancies contribute to the observed strong magnetism.

Key words: Bi$_{2}$Fe$_{4}$O$_{9}$, strong ferromagnetism, room temperature, NaBH$_{4}$

中图分类号:  (Fabrication of magnetic nanostructures)

  • 75.75.Cd
75.85.+t (Magnetoelectric effects, multiferroics) 77.55.Nv (Multiferroic/magnetoelectric films)