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Title: High performance Nd-Fe-B permanent magnets without critical elements

Scanning electron microscopy, and magnetization measurements reveal that as cast (Nd 1–xCe x) 2Fe 14B alloys contain significant amounts of α-Fe that can be dramatically reduced by annealing the alloys at 1000 °C for 3 days. The room temperature intrinsic coercivity, Hci, of (Nd 0.8Ce 0.2) 2.2Fe 14B melt spun ribbons was found to be 11 kOe, which is ~32 to ~10% higher in comparison to that of Nd 2Fe 14B (Hci = 8.3 kOe), and (Nd 0.8Ce 0.2) 2.0Fe 14B (Hci = 10 kOe), respectively. The substitution of Co for Fe in (Nd 0.8Ce 0.2) 2Fe 14–zCo zB significantly increases both TC and the maximum energy product, (BH)max. Our study shows that both Co-containing and Co-free Ce-substituted Nd 2Fe 14B alloys have excellent magnetic properties at room temperature and above. As a result, the experimental results also demonstrate the potential of Nd-Ce-Fe-TM-B based alloys as alternative to expensive Dy-containing high performance rare earth magnets.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-8915
Journal ID: ISSN 0925-8388; PII: S0925838816301955
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 668; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; permanent magnet; coercivity; maximum energy product; Nd2Fe14B; cerium
OSTI Identifier:
1245625
Alternate Identifier(s):
OSTI ID: 1359229

Pathak, Arjun K., Gschneidner, Jr., K. A., Khan, M., McCallum, R. W., and Pecharsky, V. K.. High performance Nd-Fe-B permanent magnets without critical elements. United States: N. p., Web. doi:10.1016/j.jallcom.2016.01.194.
Pathak, Arjun K., Gschneidner, Jr., K. A., Khan, M., McCallum, R. W., & Pecharsky, V. K.. High performance Nd-Fe-B permanent magnets without critical elements. United States. doi:10.1016/j.jallcom.2016.01.194.
Pathak, Arjun K., Gschneidner, Jr., K. A., Khan, M., McCallum, R. W., and Pecharsky, V. K.. 2016. "High performance Nd-Fe-B permanent magnets without critical elements". United States. doi:10.1016/j.jallcom.2016.01.194. https://www.osti.gov/servlets/purl/1245625.
@article{osti_1245625,
title = {High performance Nd-Fe-B permanent magnets without critical elements},
author = {Pathak, Arjun K. and Gschneidner, Jr., K. A. and Khan, M. and McCallum, R. W. and Pecharsky, V. K.},
abstractNote = {Scanning electron microscopy, and magnetization measurements reveal that as cast (Nd1–xCex)2Fe14B alloys contain significant amounts of α-Fe that can be dramatically reduced by annealing the alloys at 1000 °C for 3 days. The room temperature intrinsic coercivity, Hci, of (Nd0.8Ce0.2)2.2Fe14B melt spun ribbons was found to be 11 kOe, which is ~32 to ~10% higher in comparison to that of Nd2Fe14B (Hci = 8.3 kOe), and (Nd0.8Ce0.2)2.0Fe14B (Hci = 10 kOe), respectively. The substitution of Co for Fe in (Nd0.8Ce0.2)2Fe14–zCozB significantly increases both TC and the maximum energy product, (BH)max. Our study shows that both Co-containing and Co-free Ce-substituted Nd2Fe14B alloys have excellent magnetic properties at room temperature and above. As a result, the experimental results also demonstrate the potential of Nd-Ce-Fe-TM-B based alloys as alternative to expensive Dy-containing high performance rare earth magnets.},
doi = {10.1016/j.jallcom.2016.01.194},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 668,
place = {United States},
year = {2016},
month = {1}
}