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 Detalle_Publicacion

Phonon softening on the specific heat of nanocrystalline metals

Abstract: Specific heat enhancement in several common nanocrystalline metals is established by comparison with their bulk counterparts. Measurements were carried out in Fe, Cu, Ni and binary alloy LaAl2. The excess specific heat is evidenced as a low temperature peak below 65 K and a high temperature slope above 150 K. The experimental data are in good agreement with a model which considers contributions from the grain boundary and core atoms in the nanoparticles. This model is supported by Raman spectroscopy measurements, showing a softening of the frequency phonon modes associated with a size reduction and increase of the atomic disorder.

 Autoría: Rojas D., Fernández Barquín L., Rodríguez Fernández J., Rodríguez Fernández L., Gonzalez J.,

 Fuente: Nanotechnology, 2010, 21, 445702

Editorial: IOP Publishing

 Fecha de publicación: 05/10/2010

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1088/0957-4484/21/44/445702

ISSN: 0957-4484,1361-6528

 Proyecto español: MAT2008-06542-C04-04

Url de la publicación: http//doi.org/10.1088/0957-4484/21/44/445702

Autoría

DANIEL ROJAS PUPO

LIDIA RODRIGUEZ FERNANDEZ

JESUS ANTONIO GONZALEZ GOMEZ