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Competition or synergy between surface segregation and bulk ordering: the CuPd system

by: C. Gallis, B. Legrand, A. Saúl, G. Tréglia, P. Hecquet, B. Salanon
Surface Science, Vol. 352-354 (May 1996), pp. 588-591, doi:10.1016/0039-6028(95)01205-2  Key: citeulike:11978730

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Abstract

The theoretical segregation isotherm in CucPd1-c(111) has been studied both in the disordered and in the ordered state within an energetic model derived from the electronic structure. A segregation reversal is obtained as a function of the bulk concentration in the disordered state. In the ordered state, we obtain a great variety of surface critical behaviours: whereas the bulk order-disorder or order-order transitions are of first order, the surface ones can be of first or second order. In this last case, a wetting behaviour is shown.


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