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Ion-beam mixing in energetic collision cascades: Thermal-spike model and experiments

Published online by Cambridge University Press:  26 July 2012

Byungwoo Park  and
Hyukjae Lee
Byungwoo Park
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Hyukjae Lee
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245
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A phenomenological model of ion-beam mixing during energetic collision cascades is developed, based on the concept of a thermal spike, to correctly predict that the mixing rate Dt depends linearly on nuclear stopping power (instead of a power-law dependence), and is correlated with a heat of mixing (analogous to Darken's relation). Previous ion-beam mixing experiments from 25 different metallic bilayers agree well with the model's predictions: mixing rates (Dt)/(ion-dose) ∼ 1 nm4, and an activation enthalpy of approximately 1 eV for atomic diffusion in liquid-like cascades.

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Articles
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Journal of Materials Research , Volume 14 , Issue 1 , January 1999 , pp. 281 - 285
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Copyright © Materials Research Society 1999

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