Phonon densities of states of face-centered-cubic Ni-Fe alloys

Inelastic neutron scattering and nuclear resonant inelastic x-ray scattering were used to determine the phonon densities of states of face-centered-cubic Ni-Fe alloys. Increasing Fe concentration results in an average softening of the phonon modes. Chemical ordering of the Ni0.72Fe0.28 alloy results...

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Bibliographic Details
Published in:Journal of applied physics 2013-01, Vol.113 (17)
Main Authors: Lucas, Matthew, Mauger, L, Munoz, Jorge A., Halevy, I, Horwath, J, Semiatin, S L, Leontsev, S. O., Stone, Matthew B, Abernathy, Douglas L, Xiao, Yuming, Chow, P, Fultz, B.
Format: Article
Language:English
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Summary:Inelastic neutron scattering and nuclear resonant inelastic x-ray scattering were used to determine the phonon densities of states of face-centered-cubic Ni-Fe alloys. Increasing Fe concentration results in an average softening of the phonon modes. Chemical ordering of the Ni0.72Fe0.28 alloy results in a reduction of the partial vibrational entropy of the Fe atoms but does not significantly change the partial vibrational entropy of the Ni atoms. Changes in the phonon densities of states with composition and chemical ordering are discussed and analyzed with a cluster expansion method.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4794354