12-15 July 2011
Saint George Hotel
Africa/Johannesburg timezone
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The Surface Orientation Dependence of the Pre-Exponential Factors Extracted from the Segregation Profiles of a Cu(111/110) Bi-crystal

Presented by Mr. Charl JAFTA on 13 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track A - Condensed Matter Physics and Material Science


<p>Previous experimental investigations have only shown, without explanation, that the pre-exponential factor (D<sub>0</sub>), in the diffusion coefficient of Sb segregating in Cu, is dependent on the surface orientation of a crystal. In this study, the surface concentration of Sb in a Sb doped Cu(111/110) bi-crystal was measured using a method combining AES and linear temperature heating. Segregation parameters, including the D<sub>0</sub>’s are extracted from the experimental data of surface concentration versus temperature using the modified Darken model. The difference in the two pre-exponential factors D<sub>0</sub> (Sb in Cu(111)) and D<sub>0</sub> (Sb in Cu(110)) is explained thermodynamically in terms of entropy change ΔS that is calculated, for the first time, for a Cu(111/110) bi-crystal.

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Short Paper



Room: Asteria

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