Low temperature magnetic properties and microstructure of rapidly solidified Nd-Fe(-Co) and Sm-Co(-Fe) Laves compounds

Journal Article · Mon Apr 15 04:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347989· OSTI ID:5564679

Yang, C J; Choi, S D; Lee, W Y ^[1]

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1. Electromagnetic Materials Laboratory, Research Institute of Industrial Science and Technology, P. O. Box 135, 790-330 Pohang, Korea (KR)

Laves phases of NdFe{sub 2}, Nd(Fe{sub 0.5}Co{sub 0.5}){sub 2}, SmCo{sub 2}, and Sm(Fe{sub 0.5}Co{sub 0.5}){sub 2} stoichiometries were prepared using a rapid solidification technology. Low temperature magnetic properties show ferromagnetic behavior for Nd(Fe{sub 0.5}Co{sub 0.5}){sub 2}, SmCo{sub 2}, and Sm(Fe{sub 0.5}Co{sub 0.5}){sub 2}. Laves compounds, while a sort of antiferromagnetism has been suggested for the supposed NdFe{sub 2} compound. This rapidly solidified NdFe{sub 2} alloy is believed to consist of an unstable rhombohedral NdFe{sub 7} phase plus fine particles of a Nd-rich phase. Some evidence of a phase transition from the mixture of unstable NdFe{sub 7} compound plus Nd-rich to Nd{sub 2}Fe{sub 17} plus Fe-Nd-O phase are obtained after annealing the NdFe{sub 2} alloy. The ternary Laves compound, Sm(Fe{sub 0.5}Co{sub 0.5}){sub 2}, exhibits a high coercivity of 4 kOe at room temperature with a Curie temperature of 400 {degree}C, while the Nd(Fe{sub 0.5}Co{sub 0.5}){sub 2} compound shows a magnetic moment of 3.0--3.5 {mu}{sub {ital B}}.

• OSTI ID: 5564679
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
COBALT ALLOYS
COERCIVE FORCE
CRYSTAL STRUCTURE
CURIE POINT
FERROMAGNETISM
IRON ALLOYS
LAVES PHASES
LOW TEMPERATURE
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETISM
MEDIUM TEMPERATURE
MICROSTRUCTURE
NEODYMIUM ALLOYS
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SAMARIUM ALLOYS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE