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Xe Precipitates in Aluminum

Published online by Cambridge University Press:  01 February 2011

Robert C. Birtcher ,
Stephen E. Donnelly ,
Ian Morrison ,
Charles W. Allen ,
Kazuo Furuya ,
Minghui Song ,
Kazutaka Mitsuishi  and
Ulrich Dahmen
Robert C. Birtcher
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne IL 60439, USA
Stephen E. Donnelly
Affiliation:
Institute for Materials, University of Salford, Greater Manchester M5 4WT, UK
Ian Morrison
Affiliation:
Institute for Materials, University of Salford, Greater Manchester M5 4WT, UK
Charles W. Allen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne IL 60439, USA
Kazuo Furuya
Affiliation:
National Institute for Materials Science, 3–13 Sakura, Tsukuba 305, Japan
Minghui Song
Affiliation:
National Institute for Materials Science, 3–13 Sakura, Tsukuba 305, Japan
Kazutaka Mitsuishi
Affiliation:
National Institute for Materials Science, 3–13 Sakura, Tsukuba 305, Japan
Ulrich Dahmen
Affiliation:
National Center for Electron Microscopy, LBNL, Berkeley, CA 94720, USA
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Abstract

Real space, high-resolution transmission electron microscopy observations of Xe confined in nanometer size faceted cavities in Al yield information on both the inert gas and the matrix in which it is confined. At room temperature, Xe in such cavities can be liquid or an fcc solid. In larger cavities, Xe within can undergo melting and recrystallization. The Al surface energy can be deduced from the largest Xe nanocrystal at 300 K by setting the corresponding calculated Laplace pressure equal to the equilibrium pressure for melting of Xe, obtained from empirical bulk compression data. These surface energy values are 1.05 J m-2 for {111} facets and 1.10 Jm-2 for {200} facets. Because of the weak interactions, these values correspond to the surface tensions for Al at 300 K.

At room temperature, fluid Xe confined in small faceted cavities in aluminum has up to three ordered layers of Xe atoms at the Al interface. Conceptually in a three-dimensionally confined system of sufficiently small size, complete three-dimensional ordering of the fluid may occur. Molecular dynamics simulations have revealed that such ordering would result in fluid Xe confined to a small tetragonal volume solidifying as a body-centered cubic phase on compression.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 792: Symposium R – Radiation Effects and Ion Beam Processing of Materials , 2003 , R10.1
Copyright
Copyright © Materials Research Society 2004

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References

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