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Title: Cerium-iron-based magnetic compounds

New magnetic materials containing cerium, iron, and small additions of a third element are disclosed. These materials comprise compounds Ce(Fe.sub.12-xM.sub.x) where x=1-4, having the ThMn.sub.12 tetragonal crystal structure (space group I4/mmm, #139). Compounds with M=B, Al, Si, P, S, Sc, Co, Ni, Zn, Ga, Ge, Zr, Nb, Hf, Ta, and W are identified theoretically, and one class of compounds based on M=Si has been synthesized. The Si cognates are characterized by large magnetic moments (4.pi.M.sub.s greater than 1.27 Tesla) and high Curie temperatures (264.ltoreq.T.sub.c.ltoreq.305.degree. C.). The Ce(Fe.sub.12-xM.sub.x) compound may contain one or more of Ti, V, Cr, and Mo in combination with an M element. Further enhancement in T.sub.c is obtained by nitriding the Ce compounds through heat treatment in N.sub.2 gas while retaining the ThMn.sub.12 tetragonal crystal structure; for example CeFe.sub.10Si.sub.2N.sub.1.29 has T.sub.c=426.degree. C.
Inventors:
; ;
Issue Date:
OSTI Identifier:
1339612
Assignee:
GM Global Technology Operations LLC (Detroit, MI) ARPA-E
Patent Number(s):
9,548,150
Application Number:
13/786,807
Contract Number:
AR0000195
Resource Relation:
Patent File Date: 2013 Mar 06
Research Org:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Other works cited in this record:

High coercivity rare earth-iron magnets
patent, January 1985

Permanent magnetic material made of iron-rare earth metal alloy
patent, June 1995

A new type of soft ferromagnetic alloys: RFe12−xGex
journal, July 1998

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journal, November 1991
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  • Journal of Applied Physics, Vol. 70, Issue 10, p. 6009-6011
  • DOI: 10.1063/1.350076

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journal, November 1988
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About hydrogen insertion in ThMn12 type alloys
journal, May 1997

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journal, April 2002
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  • Journal of Magnetism and Magnetic Materials, Vol. 242-245, p. 1381-1383
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