| Numéro |
J. Phys. Colloques
Volume 47, Numéro C8, Décembre 1986
EXAFS and Near Edge Structure IV
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|---|---|---|
| Page(s) | C8-1037 - C8-1040 | |
| DOI | https://doi.org/10.1051/jphyscol:19868200 | |
J. Phys. Colloques 47 (1986) C8-1037-C8-1040
DOI: 10.1051/jphyscol:19868200
DIFFERENCE IN Fe ATOM ENVIRONMENTS BETWEEN CuFe (2% Fe) AND CuAuFe (1 AND 3% Fe) ALLOYS
J.I. BUDNICK1, M.H. CHOI1, G.H. HAYES2, D.M. PEASE1, Z. TAN1, E. KLEIN3 et B. ILLERHAUS31 Department of Physics and Institute of Materials Science, University of Connecticut, Storrs, CT 06268, U.S.A.
2 Optical Group Research, Perkin-Elmer Corporation, Danbury, CT 06810, U.S.A.
3 Institut für Atom und Festerkörper Physik, Freie Universität Berlin, D-1000 Berlin 33, F.R.G.
Abstract
According to recent 57Fe-Mössbauer measurements made at 4.2K, Fe atoms in Cu69Au30Fe1 and Cu67Au30Fe3 are dominantly ( > 80%) ferromagnetic, whereas Fe atoms in Cu98Fe2 manifest antiferromagnetic interactions (< 10% ferromagnetic). The Fe K-edge XANES and EXAFS measurements have been made on these alloys. Fluorescence, as well as transmission, data have been obtained. The XANES and EXAFS spectra for the CuAuFe alloys are quite similar to the spectra for α-Fe, which seems to reflect the clustering of ferromagnetic bcc Fe. On the other hand, the XANES and EXAFS for Cu98Fe2 closely resemble those of fcc Ni, strongly indicating the environment of antiferromagnetic fcc [MATH]-Fe. Moreover, the Fourier transform for Cu98Fe2 shows more smeared out higher shell peaks compared with those for CuAuFe. This may be the result of varying sizes of Fe clusters.