Magnetic properties of a new family of ternary rare-earth iron nitrides R sub 2 Fe sub 17 N sub 3 minus. delta. (invited)

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

DOI:https://doi.org/10.1063/1.347957· OSTI ID:5562353

Otani, Y; Hurley, D P.F.; Sun, H; Coey, J M.D. ^[1]

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1. Department of Pure and Applied Physics, Trinity College, Dublin 2, Ireland (IE)

A series of interstitial ternary nitrides R{sub 2}Fe{sub 17}N{sub 3{minus}{delta}} has been prepared via a gas-solid reaction for R=Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y. These nitrides have structures related to the Th{sub 2}Zn{sub 17} or Th{sub 2}Ni{sub 17} structures of the R{sub 2}Fe{sub 17} parent compounds, but the unit cell volumes are 6%--7% greater, and the Curie temperatures are approximately 400 K higher. The Fe-Fe exchange interactions are increased by a factor of 2.8 by nitrogenation, whereas the R-Fe exchange interactions are little changed. All compounds exhibit easy-plane anisotropy at room temperature, except for Sm{sub 2}Fe{sub 17}N{sub 3{minus}{delta}}, which shows strong uniaxial anisotropy and may be used to make permanent magnets. The Er and Tm compounds exhibit spin reorientations below room temperature. The anisotropy due to the iron sublattices is easy plane ({ital K}{sub 1} = {minus}1.3 MJ/m{sup 3} at 4.2 K for Y{sub 2}Fe{sub 17}N{sub 3}), but it changes sign to easy axis with cobalt substitution ({ital K}{sub 1} {approx} 1.0 MJ/m{sup 3} at 4.2 K for Y{sub 2}(Fe{sub 1{minus}{ital x}}Co{sub {ital x}}){sub 17}N{sub 3{minus}{delta}} when {ital x}{ge}0.2).

• OSTI ID: 5562353
• Journal Information: Journal of Applied Physics; (USA), Vol. 69:8; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM NITRIDES
MAGNETIC PROPERTIES
DYSPROSIUM NITRIDES
ERBIUM NITRIDES
GADOLINIUM NITRIDES
HOLMIUM NITRIDES
IRON NITRIDES
LUTETIUM COMPOUNDS
NEODYMIUM NITRIDES
PRASEODYMIUM NITRIDES
SAMARIUM NITRIDES
TERBIUM NITRIDES
THULIUM NITRIDES
YTTRIUM NITRIDES
CRYSTAL STRUCTURE
CURIE POINT
MAGNETIZATION
CERIUM COMPOUNDS
DYSPROSIUM COMPOUNDS
ERBIUM COMPOUNDS
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
IRON COMPOUNDS
NEODYMIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
TERBIUM COMPOUNDS
THERMODYNAMIC PROPERTIES
THULIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties