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Microstructure and Magnetic Properties of Mn55Bi45 Powders Obtained by Different Ball Milling Processes

1
School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
2
Shanghai Key Laboratory of Development & Application for Metal-Functional Materials, School of Materials Science and Engineering, Tongji University, Shanghai 200092, China
3
Materials Science and Engineering Faculty, University Politehnica of Bucharest, Bucharest 060042, Romania
*
Author to whom correspondence should be addressed.
Metals 2019, 9(4), 441; https://doi.org/10.3390/met9040441
Received: 20 March 2019 / Revised: 8 April 2019 / Accepted: 11 April 2019 / Published: 15 April 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
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Abstract

Low-temperature phase (LTP) MnBi is considered as a promising rare-earth-free permanent magnetic material with high coercivity and unique positive temperature coefficient of coercivity. Mn55Bi45 ribbons with high purity of LTP MnBi phase were prepared by melt spinning. Then, Mn55Bi45 powders with different particle size were obtained by low-energy ball milling (LEBM) with and without added surfactant. The coercivity is enhanced in both cases. Microstructure characterization reveals that Mn55Bi45 powders obtained by surfactant assisted low-energy ball milling (SALEBM) have better particle size uniformity and show higher decomposition of LTP MnBi. Coercivity can achieve a value of 17.2 kOe and the saturation magnetization (Ms) is 16 emu/g when Mn55Bi45 powders milled about 10 h by SALEBM. Coercivity has achieved a maximum value of 18.2 kOe at room temperature, and 23.5 kOe at 380 K after 14 h of LEBM. Furthermore, Mn55Bi45 powders obtained by LEBM have better magnetic properties. View Full-Text
Keywords: Mn55Bi45 powders; low-energy ball milling; surfactant; particle size; coercivity; microstructure; magnetic properties Mn55Bi45 powders; low-energy ball milling; surfactant; particle size; coercivity; microstructure; magnetic properties
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Li, X.; Pan, D.; Xiang, Z.; Lu, W.; Batalu, D. Microstructure and Magnetic Properties of Mn55Bi45 Powders Obtained by Different Ball Milling Processes. Metals 2019, 9, 441.

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