Preparation of Sm{sub 2}Fe{sub 17{minus}x}Ga{sub x}N{sub y}/C{sub y} magnets by a hydrogenation-disproportionation-desorption-recombination process

Journal Article · Thu May 01 00:00:00 EDT 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364435· OSTI ID:496668

Kubis, M; Cao, L; Handstein, A; Gebel, B; Mueller, K; Schultz, L ^[1]

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1. Institut fuer Metallische Werkstoffe, IFW Dresden, D-01171 Dresden (Germany)

A hydrogenation-disproportionation-desorption-recombination process (HDDR) was applied to Sm{sub 2}Fe{sub 17{minus}x}Ga{sub x} (x=0.5, 1, and 2). The process was studied by means of temperature-pressure analysis, x-ray diffraction and scanning electron microscopy. It was shown that Ga not only stabilizes the interstitially modified compounds Sm{sub 2}Fe{sub 17{minus}x}Ga{sub x}C{sub y} (0{lt}y{lt}3) but it also stabilizes the parent compound Sm{sub 2}Fe{sub 17{minus}x}Ga{sub x} against the disproportionation by hydrogen. Therefore, only for x=0.5 can a nearly complete HDDR be performed. The HDDR-treated and subsequently nitrogenated or carburized samples show coercivities {mu}{sub 0J}H{sub C} up to 3.1 T and 2.5 T, respectively. Hot compaction increases the density of the Sm{sub 2}Fe{sub 16.5}Ga{sub 0.5}C{sub y} powder; however, it leads to a loss of coercivity due to decomposition into {alpha}-iron and samarium carbides. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496668
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
COERCIVE FORCE
DESORPTION
FABRICATION
FERROMAGNETIC MATERIALS
GALLIUM ALLOYS
GALLIUM NITRIDES
HOT PRESSING
HYDROGENATION
INTERSTITIALS
IRON ALLOYS
IRON CARBIDES
PERMANENT MAGNETS
SAMARIUM ALLOYS
SAMARIUM CARBIDES
SCANNING ELECTRON MICROSCOPY
THERMAL ANALYSIS
X-RAY DIFFRACTION