Fultz, B. and Ahn, C. C. and Alp, E. E. and Sturhahn, W. and Toellner, T. S. (1997) Phonons in Nanocrystalline 57Fe. Physical Review Letters, 79 (5). pp. 937-940. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:FULprl97
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We measured the phonon density of states (DOS) of nanocrystalline Fe by resonant inelastic nuclear γ-ray scattering. The nanophase material shows large distortions in its phonon DOS. We attribute the high energy distortion to lifetime broadening. A damped harmonic oscillator model for the phonons provides a low quality factor, Qu, averaging about 5, but the longitudinal modes may have been broadened most. The nanocrystalline Fe also shows an enhancement in its phonon DOS at energies below 15 meV. The difference in vibrational entropy of the bulk and nanocrystalline Fe was small, owing to competing changes in the nanocrystalline phonon DOS at low and high energies.
|Additional Information:||© 1997 The American Physical Society Received 13 March 1997 The work at Caltech was supported by the U.S. National Science Foundation under Contract No. DMR-9415331, and the work at Argonne was supported by the U.S. Department of Energy under Contract No. W-31-109-EN-38.|
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