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Title: Cerium-iron-based magnetic compounds

Abstract

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:
Research Org.:
GM Global Technology Operations LLC, Detroit, MI (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1339612
Patent Number(s):
9548150
Application Number:
13/786,807
Assignee:
GM Global Technology Operations LLC (Detroit, MI)
Patent Classifications (CPCs):
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01F - MAGNETS
DOE Contract Number:  
AR0000195
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Mar 06
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Zhou, Chen, Pinkerton, Frederick E., and Herbst, Jan F.. Cerium-iron-based magnetic compounds. United States: N. p., 2017. Web.
Zhou, Chen, Pinkerton, Frederick E., & Herbst, Jan F.. Cerium-iron-based magnetic compounds. United States.
Zhou, Chen, Pinkerton, Frederick E., and Herbst, Jan F.. Tue . "Cerium-iron-based magnetic compounds". United States. https://www.osti.gov/servlets/purl/1339612.
@article{osti_1339612,
title = {Cerium-iron-based magnetic compounds},
author = {Zhou, Chen and Pinkerton, Frederick E. and Herbst, Jan F.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {1}
}

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Works referenced in this record:

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


Effect of nitrogen on the structural and magnetic properties of intermetallic compounds with the ThMn12 structure
journal, November 1991


Magnetic properties of Fe‐rich rare‐earth intermetallic compounds with a ThMn12 structure
journal, November 1988


About hydrogen insertion in ThMn12 type alloys
journal, May 1997


Structural investigations of NdFe12−x−yTixNby alloys
journal, April 2002