Low-frequency vibrational properties of nanocrystalline materials.
Phys Rev Lett
; 87(20): 205501, 2001 Nov 12.
Article
en En
| MEDLINE
| ID: mdl-11690482
The vibrational density of states (VDOS) of bulk nanocrystalline Ni and Cu (model) samples with grain diameters between 5 and 12 nm are derived from molecular-dynamics simulations. The results show an enhancement of the density of states at low and high energies. Because of large system sizes and a decomposition of the VDOS into grain and grain-boundary components, the low-frequency region can be investigated for the first time. It is found that the anomalous increase of the VDOS is mainly caused by the high number of grain-boundary atoms and that a power-law behavior of the low-frequency grain-boundary VDOS exists, which suggests a reduced dimensionality effect.
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Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Año:
2001
Tipo del documento:
Article
País de afiliación:
Suiza
Pais de publicación:
Estados Unidos