Solid-solution stability and preferential site-occupancy in (R-R′)2Fe14B compounds

被引:29
作者
Colin, C. V. [1 ,2 ]
Ito, M. [1 ,2 ,3 ]
Yano, M. [3 ]
Dempsey, N. M. [1 ,2 ]
Suard, E. [4 ]
Givord, D. [1 ,2 ,5 ]
机构
[1] CNRS, Inst NEEL, F-38000 Grenoble, France
[2] Univ Grenoble Alpes, Inst NEEL, F-38000 Grenoble, France
[3] Toyota Motor Co Ltd, Adv Mat Engn Div, Susono 4101193, Japan
[4] Inst Laue Langevin, CS 20156, F-38042 Grenoble 9, France
[5] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil
关键词
MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; VALENCE; CERIUM; R2FE14B; NEUTRON; ND;
D O I
10.1063/1.4953874
中图分类号
O59 [应用物理学];
学科分类号
摘要
The rare-earth (R) uniaxial anisotropy of R2Fe14B compounds with magnetic R atoms (e.g., Nd or Pr) is at the origin of the exceptional hard magnetic properties achieved in magnets based on these compounds. The uniaxial anisotropy found in Ce2Fe14B is attributed mainly to the magnetism of Fe. Ce is the most abundant R element and there has been much recent effort to fabricate magnets in which Ce is partially substituted for Nd. In the present neutron study of (R1-xCex)(2)Fe14B (R = La or Nd), Ce is found to enter the R2Fe14B phase over the entire composition range. The crystallographic parameters decrease with increasing Ce content and the Ce atoms preferentially occupy the smaller 4f sites. It is concluded that Ce in these (RR')(2)Fe14B compounds essentially maintains the intermediate valence character found in Ce2Fe14B. It is proposed that, in this intermediate valence state, Ce weakly contributes to uniaxial anisotropy, thus making a link with the fact that significant coercivity is preserved in Ce-substituted NdFeB magnets. Published by AIP Publishing.
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页数:4
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共 18 条
[1]   Site-preference and valency for rare-earth sites in (R-Ce)2Fe14B magnets [J].
Alam, Aftab ;
Khan, Mahmud ;
McCallum, R. W. ;
Johnson, D. D. .
APPLIED PHYSICS LETTERS, 2013, 102 (04)
[2]   3D MAGNETISM IN R2FE14B COMPOUNDS [J].
BOLZONI, F ;
GAVIGAN, JP ;
GIVORD, D ;
LI, HS ;
MOZE, O ;
PARETI, L .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1987, 66 (01) :158-162
[3]   STERIC VARIATION OF THE CERIUM VALENCE IN CE2FE14B AND RELATED-COMPOUNDS [J].
CAPEHART, TW ;
MISHRA, RK ;
MEISNER, GP ;
FUERST, CD ;
HERBST, JF .
APPLIED PHYSICS LETTERS, 1993, 63 (26) :3642-3644
[4]   Spectroscopic valence of cerium in cerium-lanthanum-iron compounds [J].
Capehart, TW ;
Mishra, RK ;
Fuerst, CD ;
Meisner, GP ;
Pinkerton, FE ;
Herbst, JF .
PHYSICAL REVIEW B, 1997, 55 (17) :11496-11501
[5]   DETECTION OF HYDROGEN-INDUCED EFFECTS IN CE2FE14BHX AND CE2FE17HX PERMANENT-MAGNETS BY LIII ABSORPTION-EDGE OF CERIUM [J].
CHABOY, J ;
GARCIA, J ;
MARCELLI, A ;
ISNARD, O ;
MIRAGLIA, S ;
FRUCHART, D .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1992, 104 :1171-1172
[6]   POLARIZED NEUTRON STUDY OF THE COMPOUNDS Y2FE14B AND ND2FE14B [J].
GIVORD, D ;
LI, HS ;
TASSET, F .
JOURNAL OF APPLIED PHYSICS, 1985, 57 (08) :4100-4102
[7]   MAGNETIC-PROPERTIES AND CRYSTAL-STRUCTURE OF ND2FE14B [J].
GIVORD, D ;
LI, HS ;
MOREAU, JM .
SOLID STATE COMMUNICATIONS, 1984, 50 (06) :497-499
[8]   A MOSSBAUER-EFFECT STUDY OF THE RE2FE14B MAGNETS, WHERE RE IS Y, PR, ND, AND GD [J].
GRANDJEAN, F ;
LONG, GJ ;
PRINGLE, OA ;
FU, J .
HYPERFINE INTERACTIONS, 1990, 62 (1-2) :131-146
[9]   Magnetic hardening of Ce2Fe14B [J].
Herbst, J. F. ;
Meyer, M. S. ;
Pinkerton, F. E. .
JOURNAL OF APPLIED PHYSICS, 2012, 111 (07)
[10]   RELATIONSHIPS BETWEEN CRYSTAL-STRUCTURE AND MAGNETIC-PROPERTIES IN ND2FE14B [J].
HERBST, JF ;
CROAT, JJ ;
PINKERTON, FE ;
YELON, WB .
PHYSICAL REVIEW B, 1984, 29 (07) :4176-4178