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What Xe Nanocrystals in Al Can Teach us in Materials Science

Published online by Cambridge University Press:  15 March 2011

C. W. Allen ,
R. C. Birtcher ,
U. Dahmen ,
K. Furuya ,
M. Song  and
S. E. Donnelly
C. W. Allen
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
R. C. Birtcher
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
U. Dahmen
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
K. Furuya
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
M. Song
Affiliation:
National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan
S. E. Donnelly
Affiliation:
Joule Laboratory, University of Salford, Manchester, M5 4WT, UK
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Abstract

Noble gases are generally very insoluble in solids. For example, Xe implanted into Al at 300 K forms a fine dispersion of crystalline precipitates and, at large enough fluence, fluid precipitates, both of which are stabilized, relative to the gas phase, by the Laplace pressure due to precipitate/matrix interface tensions. High resolution electron microscopy has been performed to determine the largest Xe nanocrystalline precipitate in local equilibrium with fluid Xe precipitates within the Al matrix. From the shape and size of the largest crystal and the Laplace pressure associated with its interface, we show that the interface tensions can be derived by setting the Laplace pressure equal to the pressure for solid/fluid Xe equilibrium derived from bulk Xe compression isotherms at the temperature of equilibration and observation. The Xe/Al interface tensions thus derived are in the range of accepted values of surface tensions for the Al matrix. Furthermore, it is suggested that this same technique may be employed to estimate unknown surface tensions of a solid matrix from the size and shape of maximal nanocrystals of a noble gas element, which have been equilibrated in that matrix at the temperature of observation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 703: Symposia U/V – Nanophase and Nanocomposite Materials IV , 2001 , V11.2
Copyright
Copyright © Materials Research Society 2002

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References

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