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Intensities of Mössbauer diffractions from polycrystalline bcc Fe-57

Kriplani, U. and Lin, J. Y. Y. and Regehr, M. W. and Fultz, B. (2002) Intensities of Mössbauer diffractions from polycrystalline bcc Fe-57. Physical Review B, 65 (2). Art. No. 024405. ISSN 0163-1829. doi:10.1103/PhysRevB.65.024405.

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Diffraction patterns were measured on a polycrystalline bcc 57Fe foil using a Mössbauer powder diffractometer with high sensitivity. Measurements with and without a magnetic field normal to the scattering plane showed large differences in the diffracted intensities of the different nuclear resonances. These magnetic effects on diffraction intensities were interpreted successfully with a single scattering theory developed to handle isotropic and anisotropic orientation distributions of hyperfine magnetic fields. When there is coherent interference between nuclear scattering and x-ray Rayleigh scattering, an asymmetry in the coherent intensity of the three pairs of diffractions for the 57Fe magnetic sextet (1,6), (2,5), (3,4) is predicted. This is largest in the presence of a uniaxial magnetic field, and the calculated and measured asymmetries were in good agreement. A reduced diffraction intensity for lines (2,5) and (3,4) caused by spin-flip incoherence was also measured. The effects of dynamical diffraction, if present, are shown to be small.

Item Type:Article
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Lin, J. Y. Y.0000-0001-9233-0100
Fultz, B.0000-0002-6364-8782
Additional Information:© 2001 The American Physical Society. Received 4 May 2001; published 10 December 2001. This work was supported by the U.S. National Science Foundation under Contract No. DMR-9816617.
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6120
Deposited By: Tony Diaz
Deposited On:25 Nov 2006
Last Modified:08 Nov 2021 20:31

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