A Moessbauer-effect study of a series of R sub 2 Fe sub 14 C hard magnetic materials

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

DOI:https://doi.org/10.1063/1.347763· OSTI ID:5690224

Long, G J; Pringle, O A; Marasinghe, G K ^[1]; Grandjean, F ^[2]; Buschow, K H.J. ^[3]

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1. Department of Chemistry, University of Missouri-Rolla, Rolla, Missouri 65401 (USA) Department of Physics, University of Missouri-Rolla, Rolla, Missouri 65401 (USA)
2. Institut de Physique, Universite de Liege, B-4000 Sart-Tilman, (Belgium)
3. Philips Research Laboratory, NL-5600 JA Eindhoven, (The Netherlands)

The {sup 57}Fe Moessbauer-effect spectra of the series of hard magnetic materials, R{sub 2}Fe{sub 14}C, where R is Nd, Gd, Tb, Dy, Ho, and Lu, have been measured at 295 K. All of these carbides exhibit uniaxial magnetic anisotropy. The spectra resemble those obtained for the related R{sub 2}Fe{sub 14}B compounds and have been fit with the model used earlier for Nd{sub 2}Fe{sub 14}B. The magnitude of the hyperfine field on each site, as a function of rare earth, parallels the Curie temperature; the maximum hyperfine fields and the maximum Curie temperature are observed for Gd{sub 2}Fe{sub 14}C. A linear correlation is observed between the hyperfine fields on the six sites in the analogous borides and carbides; however, these fields are systematically smaller in the carbides. The decrease in the tetragonal unit cell {ital c}-axis length in the carbides apparently reduces the exchange interactions between the 8{ital j} and 16{ital k} iron layers and hence reduces the moments. The isomer shift on each site decreases as the atomic number of the rare earth increases, whereas the quadrupole interactions are independent of rare earth.

• OSTI ID: 5690224
• 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
DYSPROSIUM CARBIDES
MAGNETIC PROPERTIES
GADOLINIUM CARBIDES
HOLMIUM CARBIDES
IRON CARBIDES
LUTETIUM CARBIDES
NEODYMIUM CARBIDES
TERBIUM CARBIDES
IRON 57
MEDIUM TEMPERATURE
MOESSBAUER EFFECT
CARBIDES
CARBON COMPOUNDS
DYSPROSIUM COMPOUNDS
EVEN-ODD NUCLEI
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
INTERMEDIATE MASS NUCLEI
IRON COMPOUNDS
IRON ISOTOPES
ISOTOPES
LUTETIUM COMPOUNDS
NEODYMIUM COMPOUNDS
NUCLEI
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
STABLE ISOTOPES
TERBIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties