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Rare gas bubbles in muscovite mica implanted with xenon and krypton

Published online by Cambridge University Press:  03 March 2011

G.A. Hishmeh
Affiliation:
Department of Materials Science and Engineering, Marquette University, Milwaukee, Wisconsin 53233
L. Cartz
Affiliation:
Department of Materials Science and Engineering, Marquette University, Milwaukee, Wisconsin 53233
F. Desage
Affiliation:
Laboratoire de Métallurgie Physique, Université de Poitiers, Poitiers Cedex 86022, France
C. Templier
Affiliation:
Laboratoire de Métallurgie Physique, Université de Poitiers, Poitiers Cedex 86022, France
J.C. Desoyer
Affiliation:
Laboratoire de Métallurgie Physique, Université de Poitiers, Poitiers Cedex 86022, France
R.C. Birtcher
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
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Abstract

Xenon and krypton have been implanted into muscovite mica at room temperature and at liquid nitrogen temperature. The behavior of the implanted Xe and Kr was followed by low-temperature transmission electron microscopy and energy dispersive x-ray analysis. An electron diffraction pattern of diffuse bands is observed at room temperature due to the presence of fluid rare gas and to noncrystalline mica. Visible cavities with diameters 10–300 nm formed in the Xe-implanted mica. Visible cavities in room-temperature Kr-implanted mica ranged from 5–50 nm in diameter. The gas pressures at room temperature in the cavities are estimated, assuming all of the implanted gas precipitated in cavities to be ∼10 MPa for Xe and ∼20 MPa for Kr. These pressures are considerably lower than found for rare gases implanted in metals and ceramics, but sufficient to liquefy the rare gases at room temperature. The Xe and Kr were observed by dark-field microscopy to form fcc crystalline solids within the cavities at temperatures below their triple points, with lattice parameters of a(xe) = 0.630 ± 0.0015 nm and a(Kr) = 0.565 ± 0.005 nm. The solid Xe within bubbles was unstable under the electron beam of the transmission electron microscope at temperatures above 80 K, while the solid Kr within bubbles was unstable at temperatures as low as 35 K. The crystalline mica matrix undergoes a transformation from a crystalline structure to an amorphous structure as a result of implantation.

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Articles
Copyright
Copyright © Materials Research Society 1994

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References

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