Surface segregation effect for transition-metal alloys in the coherent-potential approximation: general considerations and calculations for Cu-Ni alloys

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, , Citation M Brejnak and P Modrak 1990 J. Phys.: Condens. Matter 2 869 DOI 10.1088/0953-8984/2/4/008

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1 Inst. of Phys. Chem., Polish Acad. of Sci., Warsaw, Poland

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0953-8984/2/4/869

Abstract

The surface segregation is calculated in the coherent-potential approximation. The influence of the surface potential, d-band fillings and d-level splitting of alloys components on the segregation is examined for a model density of states. The realistic tight-binding Hamiltonian is used to calculate the segregation for Cu-Ni alloys. The model for all reasonable values of parameters predicts the segregation of copper for all alloy compositions.

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10.1088/0953-8984/2/4/008