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Analysis of Experiments in Helium Microbeam Mixing

Published online by Cambridge University Press:  28 February 2011

John B. Davis ,
R. E. Benenson  and
David Peak
John B. Davis
Affiliation:
Physics Dept., SUNY at Albany, Albany, NY 12222
R. E. Benenson
Affiliation:
Physics Dept., SUNY at Albany, Albany, NY 12222
David Peak
Affiliation:
Physics Dept., Union College, Schenectady, NY 12308
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Abstract

We have continued to investigate ion-beam mixing in bilay-er targets irradiated by 2-MeV He+ microbeams at room temperature. Although we have previously reported a linear dependence of interface width on dose for Cu/Al targets 1, more extensive results have not supported this conclusion, within statistical uncertainty, it appears that the interface width in Cu/Al (1) is proportional to the square root of dose, at constant dose rate, (2) is larger in Al than in Cu, for the same dose, (3) is proportional to the 1/4 power of dose rate, and (4) is absent at liquid nitrogen temperature. Calculations of the expected interface growth rate from a radiation-enhanced diffusion model have provided order-of-magnitude agreement with observed rates. Additionally, intermixing of Cu and Al outside the damaged area may indicate significant transverse diffusion of vacancies.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 235: Symposium A – Phase Formation and Modification by Beam-Solid Interactions , 1991 , 503
Copyright
Copyright © Materials Research Society 1992

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References

REFERENCES

1. Davis, J. B. and Benenson, R. E., in Surface Chemistry and Beam-Solid Interactions, eds. Atwater, H., Houle, F., Lowndes, D. (Mat. Res. Soc. Proc. 201. Pittsburgh, PA, 1991) p. 245.Google Scholar
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