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Orientation dependence of the surface segregation kinetics in single crystals

✍ Scribed by Terblans, J. J.; Erasmus, W. J.; Viljoen, E. C.; du Plessis, J.

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
210 KB
Volume
28
Category
Article
ISSN
0142-2421

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✦ Synopsis

Experimental results are presented that support an earlier hypothesis that the bulk diffusion near surfaces is orientation dependent. From a literature study, the calculated surface energy of the (110) surface is higher than that of the (111) surface in fcc crystals, which could lead to different values of the bulk vacancy formation energy. This energy term determines the equilibrium bulk vacancy concentration and consequently also the bulk diffusion coefficient. Experimental surface segregation results were obtained for Cu(0.1%Sb) crystals for the said ( 110) and (111) surfaces using the linear heating method. The results, D 110 > D 111 , confirm the assumptions, and the order of magnitude experimental values of the activation energies are compatible with the calculated surface energies from the literature.

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The equilibrium surface segregation of Ag to the low-index surfaces of Cu single crystals is presented. It is found that the close-packed surface of the (111) orientation allows a high interaction parameter resulting in a discontinuous transition in the surface concentration against temperature, as