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Journal ArticleDOI

Free energy of segregation at alloy surfaces

01 Dec 1979-Solid State Communications (Pergamon)-Vol. 32, Iss: 11, pp 1159-1161
TL;DR: In this article, the free energy of segregation at semi-infinite solid binary alloy surfaces is calculated using a quasi-chemical approach, where the alloy is treated to be a non-regular solution and the concentration is assumed to be different only at the surface layer.
About: This article is published in Solid State Communications.The article was published on 1979-12-01. It has received 1 citations till now. The article focuses on the topics: Specific surface energy & Surface layer.
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57 citations

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1,963 citations

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Paul Wynblatt1, R. Ku1
TL;DR: In this paper, a unified formalism of surface segregation was proposed for grain boundary segregation based on the reduction in lattice strain energy which accompanies the transfer of misfitting solute atoms from the lattice to the boundary.

369 citations

Journal ArticleDOI
TL;DR: In this article, a quasichemical theory was proposed to predict surface segregation in non-regular solutions, where the surface concentration and surface short-range-order (SRO) parameters were calculated for Ag-Au and Ag-Pd systems.
Abstract: We present a quasichemical theory to predict surface segregation in nonregular solutions. Surface concentration and surface short-range-order (SRO) parameters have been calculated for Ag-Au and Ag-Pd systems. Our results show segregation of Ag on the surface in both the systems. It is observed that the nonregular-solution model does not give results much different from the regular-solution model. However, the surface SRO parameters are significantly different from their bulk values. Surface concentrations averaged over the first few layers have also been calculated. Our results are in agreement with the results obtained from Auger electron spectroscopy.

38 citations