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Author Long, G. J. ♦ Pringle, O. A. ♦ Marasinghe, G.K. ♦ Buschow, K.H.J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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 ♦ Ceramics, Cermets, & Refractories- Physical Properties
Abstract 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.
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1991-04-15
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 69
Issue Number 8


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