The Influence of Surface Orientation and Sample Thickness on the Substitutional Bulk Diffusion Coefficient in Thin Samples

J. Du Plessis, S. P. Russo, J. Hoadley and E. C. Mortimer
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J. Du Plessis: Department of Applied Physics, Royal Melbourne Institute of Technology University, Melbourne 3001, Australia
S. P. Russo: Department of Applied Physics, Royal Melbourne Institute of Technology University, Melbourne 3001, Australia
J. Hoadley: Department of Applied Physics, Royal Melbourne Institute of Technology University, Melbourne 3001, Australia
E. C. Mortimer: Materials Research Group, iThemba Laboratories, PO Box 722, Somerset West, ZA-7129, Republic of South Africa

Surface Review and Letters (SRL), 2003, vol. 10, issue 02n03, 241-246

Abstract: Model calculations are presented to show that for thin samples the vacancy formation energy is determined by the concentration of vacancies in the bulk. The equilibrium vacancy concentration is calculated and its effect on the substitutional bulk diffusion coefficient is discussed. It is shown that the diffusion coefficientDexhibits abrupt transitions as a function of temperature but that these transitions occur at temperatures which are independent of the surface orientation. The effects are confined to thin samples and for thicker samples the model predicts the well-established bulk diffusion values independent of surface properties.

Date: 2003
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DOI: 10.1142/S0218625X03005037

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