Vibrations of micro-eV energies in nanocrystalline microstructures.

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