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Mössbauer spectrometry study of the hyperfine fields and electronic structure of Fe-Co alloys

Hamdeh, H. H. and Fultz, B. and Pearson, D. H. (1989) Mössbauer spectrometry study of the hyperfine fields and electronic structure of Fe-Co alloys. Physical Review B, 39 (16, pt). pp. 11233-11240. ISSN 0163-1829. doi:10.1103/PhysRevB.39.11233.

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We obtained 57Fe hyperfine-field parameters from Mössbauer spectra of Fe-Co alloys at 77 and 295 K. We also obtained the numbers of 3d electrons at Fe atoms by electron-energy-loss spectrometry (EELS). Together with bulk-magnetization data, we deduce how the occupancies of the 3d↑ and 3d↓ states at Fe atoms change with Co concentration. Changes in the total numbers of 3d electrons at Fe atoms were found to be small, with the Mössbauer data indicating a maximum of about 0.2 electrons at 30 at. % Co, and the EELS data indicating a change of similar magnitude but of opposite sign. From both our isomer-shift and hyperfine-magnetic-field (HMF) data, we deduce a slight reduction in the occupancy of 4s states with Co concentration of dn4s/dc=-0.02 electrons, which is principally due to a loss of 4s↓ electrons. The model employed for the calculation of HMF distributions in terms of conduction- and core-electron polarizations worked well for disordered Fe-Co alloys, and was used to analyze the changes in HMF after the disorder→order transformation. It showed that these HMF changes upon ordering are primarily due to changes in conduction-electron polarization.

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Fultz, B.0000-0002-6364-8782
Additional Information:© 1989 The American Physical Society Received 31 January 1989 The authors thank C.C. Ahn for help with the EELS measurements. This work was supported by the U.S. Department of Energy under Contract No. DE-FG03-86ER45270.
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Department of Energy (DOE)DE-FG03-86ER45270
Issue or Number:16, pt
Record Number:CaltechAUTHORS:HAMprb89
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ID Code:6080
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Deposited On:16 Nov 2006
Last Modified:08 Nov 2021 20:31

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