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

Journal Article


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 (RE 100 = La 30.6 Ce 50.2 Pr 6.4 Nd 12.8 ) 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 Dy 2 O 3 and Ca, with the coercivity increasing from 2.44 kOe to 11.43 kOe for co-dopant percentages of 7 wt.% Dy 2 O 3 + 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 RE 2 Fe 14 B phase to enhance the magnetocrystalline anisotropy; due to the reductive effect of Ca on Dy 2 O 3 , nanocrystals of Dy-rich RE 2 Fe 14 B 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.

UOW Authors


  •   Li, Yingfei (external author)
  •   Tian, Na (external author)
  •   Fan, Xiaodong (external author)
  •   You, Caiyin (external author)
  •   Pei, Wenli (external author)
  •   Cheng, Zhenxiang

Publication Date


  • 2017

Citation


  • Li, Y., Tian, N., Fan, X., You, C., Pei, W. & Cheng, Z. (2017). Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets. Nanoscale Research Letters, 12 618-1-618-6.

Scopus Eid


  • 2-s2.0-85038415648

Start Page


  • 618-1

End Page


  • 618-6

Volume


  • 12

Place Of Publication


  • Germany

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 (RE 100 = La 30.6 Ce 50.2 Pr 6.4 Nd 12.8 ) 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 Dy 2 O 3 and Ca, with the coercivity increasing from 2.44 kOe to 11.43 kOe for co-dopant percentages of 7 wt.% Dy 2 O 3 + 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 RE 2 Fe 14 B phase to enhance the magnetocrystalline anisotropy; due to the reductive effect of Ca on Dy 2 O 3 , nanocrystals of Dy-rich RE 2 Fe 14 B 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.

UOW Authors


  •   Li, Yingfei (external author)
  •   Tian, Na (external author)
  •   Fan, Xiaodong (external author)
  •   You, Caiyin (external author)
  •   Pei, Wenli (external author)
  •   Cheng, Zhenxiang

Publication Date


  • 2017

Citation


  • Li, Y., Tian, N., Fan, X., You, C., Pei, W. & Cheng, Z. (2017). Synergetic Effect of Dy2O3 and Ca Co-Dopants towards Enhanced Coercivity of Rare Earth Abundant RE-Fe-B Magnets. Nanoscale Research Letters, 12 618-1-618-6.

Scopus Eid


  • 2-s2.0-85038415648

Start Page


  • 618-1

End Page


  • 618-6

Volume


  • 12

Place Of Publication


  • Germany