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First principles study of transition-metal substitutions in Sm–Co permanent magnets.
- Source :
- Applied Physics Letters; 9/20/2004, Vol. 85 Issue 12, p2286-2288, 3p, 3 Charts
- Publication Year :
- 2004
-
Abstract
- The microchemistry and magnetism of conventional and high-temperature Sm-Co permanent magnets are investigated by first-principles calculations. Particular emphasis is on the site preference for the substitution of Cu, Ti, and Zr in SmCo<subscript>5</subscript> and Sm2Co<subscript>17</subscript> compounds. Cu substitution is more favorable in the 1:5 phase, in agreement with experimental findings. Titanium and zirconium have positive solution energies for both the phases, with Ti(Zr) having slight preference for the 1:5 (2:17) phase. Some Zr may segregate to the phase boundaries because of its large solution energy. For Ti and Zr the dumbbell site of the 2:17 phase is preferred over the other three inequivalent cobalt sites. These results are used to discuss the observed cellular nanostructure of the high-temperature Sm-Co hard magnets with composition close to the 2:17 phase. [ABSTRACT FROM AUTHOR]
- Subjects :
- MICROCHEMISTRY
MAGNETISM
PERMANENT magnets
METALS
NANOSTRUCTURES
PHYSICS
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 85
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 14546690
- Full Text :
- https://doi.org/10.1063/1.1792791