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Nanoscale Res Lett. 2017 Dec 13;12(1):618. doi: 10.1186/s11671-017-2407-z.

Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets.

Author information

1
School of Materials Science & Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China.
2
Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, NSW2500, Australia.
3
School of Materials Science & Engineering, Xi'an University of Technology, Xi'an, 710048, People's Republic of China. caiyinyou@xaut.edu.cn.
4
Key Laboratory for Anisotropy & Texture of Materials, Northeastern University, Shenyang, 110819, People's Republic of China.
5
Institute for Superconducting & Electronic Materials, University of Wollongong, Wollongong, NSW2500, Australia. cheng@uow.edu.cn.

Abstract

Low coercivity is the main disadvantage of RE-Fe-B permanent magnets containing highly abundant rare earths (RE: La, Ce) from the application point of view, even though they exhibit many cost and resource advantages. In this work, an industrial mixed rare earth alloy (RE100 = La30.6Ce50.2Pr6.4Nd12.8) with a high amount of the more abundant elements was adopted to fabricate RE-Fe-B permanent magnets by means of mechanical alloying accompanied by post-annealing. A synergetic effect towards enhancing the coercivity was observed after co-doping with Dy2O3 and Ca, with the coercivity increasing from 2.44 kOe to 11.43 kOe for co-dopant percentages of 7 wt.% Dy2O3 + 2.3 wt.% Ca. Through analysis of the phase constituents and microstructure, it was determined that part of the Dy atoms entered the matrix of RE2Fe14B phase to enhance the magnetocrystalline anisotropy; due to the reductive effect of Ca on Dy2O3, nanocrystals of Dy-rich RE2Fe14B were present throughout the matrix, which could increase the resistance to domain wall movement. These are the dominant factors behind the improvement of the coercivity of the RE-Fe-B magnets with highly abundant RE elements.

KEYWORDS:

Abundant RE-Fe-B magnets; Coercivity; Dy2O3 and ca co-dopants; Synergetic effect

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