High coercivity in Sm sub 2 Fe sub 17 N sub x magnets

Journal Article · Mon Dec 24 04:00:00 EST 1990 · Applied Physics Letters; (USA)

DOI:https://doi.org/10.1063/1.104202· OSTI ID:5941375

Schnitzke, K; Schultz, L; Wecker, J; Katter, M ^[1]

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1. Siemens AG, Research Laboratories, Erlangen (Germany)

Using mechanical alloying and a subsequent two-step heat treatment we produced magnetically isotropic microcrystalline Sm{sub 2}Fe{sub 17}N{sub {ital x}} samples with room-temperature coercivities up to 24 kA/cm (30 kOe). The remanence and the energy product are equivalent to similarly prepared Nd-Fe-B samples, but the properties at elevated temperatures are superior because of the high Curie temperature of 470 {degree}C and the large anisotropy field of 14 T at room temperature. From differential scanning calorimetry it is concluded that the 2:17 nitride is metastable. It decomposes into Sm nitride and {alpha}-Fe above 600 {degree}C.

• OSTI ID: 5941375
• Journal Information: Applied Physics Letters; (USA), Journal Name: Applied Physics Letters; (USA) Vol. 57:26; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
COERCIVE FORCE
CURIE POINT
IRON ALLOYS
IRON COMPOUNDS
IRON NITRIDES
MAGNETIC PROPERTIES
MAGNETIZATION
MAGNETS
NITRIDES
NITROGEN COMPOUNDS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PNICTIDES
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SAMARIUM ALLOYS
SAMARIUM COMPOUNDS
SAMARIUM NITRIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE