Intrinsic magnetic properties of R sub 2 Fe sub 17 C sub y N sub x compounds: ( R =Y, Sm, Er, and Tm)

Journal Article · Thu Aug 15 00:00:00 EDT 1991 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.349420· OSTI ID:5329626

Kou, X C ^[1]; Groessinger, R ^[2]; Katter, M; Wecker, J; Schultz, L ^[3]; Jacobs, T H; Buschow, K H.J. ^[4]

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1. Institute of Metal Research, Academia Sinica, Shenyang 110 015 (People's Republic of China)
2. Institut fuer Experimentalphysik, Technische Universitaet Vienna, Wiedner Hauptstrasse 8-10, A-1040 Wien (Austria)
3. Siemens AG, Research Laboratories, D-8520 Erlangen (Federal Republic of Germany)
4. Philips Research Laboratories, 5600 JA Eindhoven (Netherlands) Kamerlingh Onnes Laboratory, 2300 RA Leiden (Netherlands)

Samples of {ital R}{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} ({ital R}=Y, Sm, Er, Tm) were prepared by arc melting appropriate amount of {ital R}, Fe, and C, vacuum annealing at 1373 K and finally annealing at 740 K in nitrogen for 10 h. The magnetic properties of these compounds were investigated by means of ac initial susceptibility, magnetization measurements, and x-ray diffraction. The thermal stability of the nitride phase was studied by differential scanning calorimetry. It was found that, when heated above 600 K, {ital R}{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} irreversibly decomposes N which is irrespective of the carbon concentration and rare-earth element. The Curie temperatures of {ital R}{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} are independent of the carbon concentration and are approximately 400 K higher than those of the corresponding pure {ital R}{sub 2}Fe{sub 17} compounds. However, the Curie temperatures cannot be correlated to the composition {ital x} of the initial {ital R}{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} compounds at room temperature because some N was lost during the heating to {ital T}{sub {ital c}}. In the Er and Tm compounds spin reorientation transitions were found, marking the change of the easy magnetization direction from the {ital c} axis to the basal plane with increasing temperature. The Tm compounds show an additional magnetic transition at low temperatures (below 40 K). A coexistence of the hexagonal and the rhombohedral structural modifications was found in Er{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} when {ital y}{lt}1.5, characterized by two different spin reorientation temperatures. The anisotropy fields of Sm{sub 2}Fe{sub 17}C{sub {ital y}}N{sub {ital x}} are higher than that of Sm{sub 2}Fe{sub 17}N{sub {ital x}}.

• OSTI ID: 5329626
• Journal Information: Journal of Applied Physics; (United States), Vol. 70:4; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ERBIUM CARBIDES
MAGNETIC PROPERTIES
ERBIUM NITRIDES
IRON CARBIDES
IRON NITRIDES
SAMARIUM CARBIDES
SAMARIUM NITRIDES
THULIUM CARBIDES
THULIUM NITRIDES
YTTRIUM CARBIDES
YTTRIUM NITRIDES
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
QUATERNARY COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
ERBIUM COMPOUNDS
IRON COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
THULIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties