Structure and Magnetic Properties of R sub 2 Fe sub 17 C sub x (x approx 2.5)

Structure and Magnetic Properties of R sub 2 Fe sub 17 C sub x (x approx 2.5)

A series of rare-earth iron carbides were prepared by heat treatment of R sub 2 Fe sub 17 compounds in methane. The nominal composition of these carbides is R sub 2 Fe sub 17 C sub x , x approx 2.5. The carbides retain the original Th sub 2 Zn sub 17 or Th sub 2 Ni sub 17 structure with a 6.5% volum...

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Veröffentlicht in:Applied physics letters 1992-01, Vol.60 (1), p.129-131
Hauptverfasser: Liao, L X, Chen, X, Altounian, Z, Ryan, D H
Format: Artikel
Sprache:eng
Schlagworte:
ANISOTROPY
CARBIDES
CARBON COMPOUNDS
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
CURIE POINT
FERROMAGNETISM
IRON COMPOUNDS
MAGNETISM
MATERIALS SCIENCE
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE 360204 > Ceramics, Cermets, & Refractories-- Physical Properties
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Zusammenfassung:A series of rare-earth iron carbides were prepared by heat treatment of R sub 2 Fe sub 17 compounds in methane. The nominal composition of these carbides is R sub 2 Fe sub 17 C sub x , x approx 2.5. The carbides retain the original Th sub 2 Zn sub 17 or Th sub 2 Ni sub 17 structure with a 6.5% volume expansion over the carbon-free unit cell. For Sm sub 2 Fe sub 17 C sub 2.5 , the Curie temperature is 760K and the easy magnetization direction is along the C axis. The anisotropy field of Sm sub 2 Fe sub 17 C sub 2.5 at room temperature is 15 plus/minus 0.5 T.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.107346