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Home > Issues > SearchEffect of Nd Substitution for Mischmetal on Magnetic Properties in (MM,Nd)-Fe-B Ribbons
Journal of Magnetics, Volume 25, Number 1, 31 Mar 2020, Pages 43-47
Zhu-bai Li * 
(Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Jing-zhao Li (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Zhi-yi Xu (National Institute of Metrology, Beijing 100029, China), Yong-feng Li (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Xue-feng Zhang (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science)
(Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Jing-zhao Li (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Zhi-yi Xu (National Institute of Metrology, Beijing 100029, China), Yong-feng Li (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science), Xue-feng Zhang (Key Laboratory of Integrated Exploitation of Bayan Obo Multi-Metal Resources, Inner Mongolia University of Science)
Abstract
Mischmetal-based permanent magnets of (MM,Nd)12Fe82B6 were prepared by melt-spinning method via varying
the relative content of mischmetal and Nd. The coercivity is low, and the squareness of hysteresis loop is
poor in MM12Fe82B6 ribbons. The x-ray diffraction pattern, maximum of δm value as well as the temperature
dependence of magnetization indicates that the partial substitution of Nd for MM could improve the crystallinity
in the mischmetal-based magnets, and both the coercivity and squareness of hysteresis loop increase with Nd
substitution for mischmetal. The increase of squareness should be partially attributed to the improvement in
the crystallinity of R2Fe14B crystal phase. For more than 4 at.% Nd substitution the coercivity is not less than
that in corresponding (Ce,Nd)-based magnets, and the coercivity of 7.81 kOe and the maximum energy product
of 15.41 MGOe were obtained in MM8Nd4Fe82B6 ribbons. These investigations show that it is reasonable to
use the low cost mischmetal to prepare the resource-saving rare-earth magnets, and that optimizing the
addition amount of Nd is necessary to improve the crystallinity and enhance the magnetic properties.
the relative content of mischmetal and Nd. The coercivity is low, and the squareness of hysteresis loop is
poor in MM12Fe82B6 ribbons. The x-ray diffraction pattern, maximum of δm value as well as the temperature
dependence of magnetization indicates that the partial substitution of Nd for MM could improve the crystallinity
in the mischmetal-based magnets, and both the coercivity and squareness of hysteresis loop increase with Nd
substitution for mischmetal. The increase of squareness should be partially attributed to the improvement in
the crystallinity of R2Fe14B crystal phase. For more than 4 at.% Nd substitution the coercivity is not less than
that in corresponding (Ce,Nd)-based magnets, and the coercivity of 7.81 kOe and the maximum energy product
of 15.41 MGOe were obtained in MM8Nd4Fe82B6 ribbons. These investigations show that it is reasonable to
use the low cost mischmetal to prepare the resource-saving rare-earth magnets, and that optimizing the
addition amount of Nd is necessary to improve the crystallinity and enhance the magnetic properties.
Keywords: permanent magnets; mischmetal; crystallinity; coercivity
DOI: https://doi.org/10.4283/JMAG.2020.25.1.043
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