Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets
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 = La30.6Ce50.2Pr...
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doaj-3a0f39992b294e17958e635da2de12f62020-11-24T23:02:01ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2017-12-011211610.1186/s11671-017-2407-zSynergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B MagnetsYingfei Li0Na Tian1Xiaodong Fan2Caiyin You3Wenli Pei4Zhenxiang Cheng5School of Materials Science & Engineering, Xi’an University of TechnologySchool of Materials Science & Engineering, Xi’an University of TechnologySchool of Materials Science & Engineering, Xi’an University of TechnologySchool of Materials Science & Engineering, Xi’an University of TechnologyKey Laboratory for Anisotropy & Texture of Materials, Northeastern UniversityInstitute for Superconducting & Electronic Materials, University of WollongongAbstract 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.http://link.springer.com/article/10.1186/s11671-017-2407-zAbundant RE-Fe-B magnetsCoercivityDy2O3 and ca co-dopantsSynergetic effect |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yingfei Li Na Tian Xiaodong Fan Caiyin You Wenli Pei Zhenxiang Cheng |
spellingShingle |
Yingfei Li Na Tian Xiaodong Fan Caiyin You Wenli Pei Zhenxiang Cheng Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets Nanoscale Research Letters Abundant RE-Fe-B magnets Coercivity Dy2O3 and ca co-dopants Synergetic effect |
author_facet |
Yingfei Li Na Tian Xiaodong Fan Caiyin You Wenli Pei Zhenxiang Cheng |
author_sort |
Yingfei Li |
title |
Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets |
title_short |
Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets |
title_full |
Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets |
title_fullStr |
Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets |
title_full_unstemmed |
Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets |
title_sort |
synergetic effect of dy2o3 and ca co-dopants towards enhanced coercivity of rare earth abundant re-fe-b magnets |
publisher |
SpringerOpen |
series |
Nanoscale Research Letters |
issn |
1931-7573 1556-276X |
publishDate |
2017-12-01 |
description |
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. |
topic |
Abundant RE-Fe-B magnets Coercivity Dy2O3 and ca co-dopants Synergetic effect |
url |
http://link.springer.com/article/10.1186/s11671-017-2407-z |
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