Fabrication of Mn-Bi Nanoparticles by High Energy Ball Milling

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  • Lam Nguyen Mau
    Hanoi Pedagogical University No. 2 Hanoi National University of Education
  • Thi Tran Minh
    Hanoi National University of Education
  • Thanh Pham Thi
    Institute of Materials Science, Vietnam Academy of Science and Technology
  • Yen Nguyen Hai
    Institute of Materials Science, Vietnam Academy of Science and Technology
  • Dan Nguyen Huy
    Institute of Materials Science, Vietnam Academy of Science and Technology

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Abstract

The MnBi low temperature phase with high value and positive temperature coefficient of its coercivity has a potential for production of both the nanocomposite and hybrid permanent magnets. In this report, we present our results of investigation of fabrication of Mn55Bi45 nanoparticles by using high energy ball milling method. The Mn55Bi45 alloy was first arc-melted and then ball-milled for various time of 0.25–8 h in different environments of Argon, Alcohol, Petrol and Xylene. The resulted powder was subsequently annealed at temperatures of 200 and 250°C for time periods of 0.5–4 h in Ar gas. The fraction of the MnBi low temperature phase and the size of the particles strongly depend on the fabrication conditions. The desired MnBi nanoparticles with size of 25–100 nm and coercivity μ0Hc > 1 T can be achieved by choosing appropriate fabrication conditions.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 56 (9), 1394-1398, 2015

    The Japan Institute of Metals and Materials

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