Vibrations of micro-eV energies in nanocrystalline microstructures.
Journal Article (Journal Article)
The phonon density of states of nanocrystalline bcc Fe and nanocrystalline fcc Ni3Fe were measured by inelastic neutron scattering in two different ranges of energy. As has been reported previously, the nanocrystalline materials showed enhancements in their phonon density of states at energies from 2 to 15 meV, compared to control samples composed of large crystals. The present measurements were extended to energies in the micro-eV range, and showed significant, but smaller, enhancements in the number of modes in the energy range from 5 to 18 microeV. These modes of micro-eV energies provide a long-wavelength limit that bounds the fraction of modes at milli-eV energies originating with the cooperative dynamics of the nanocrystalline microstructure.
Full Text
Duke Authors
Cited Authors
- Yue, AF; Papandrew, AB; Delaire, O; Fultz, B; Chowdhuri, Z; Dimeo, RM; Neumann, DA
Published Date
- November 10, 2004
Published In
Volume / Issue
- 93 / 20
Start / End Page
- 205501 -
PubMed ID
- 15600935
Electronic International Standard Serial Number (EISSN)
- 1079-7114
International Standard Serial Number (ISSN)
- 0031-9007
Digital Object Identifier (DOI)
- 10.1103/physrevlett.93.205501
Language
- eng