Publication

Theory of surface segregation in transition-metal alloys

1987

Abstract

A simple tight-binding theory of surface-segregation in transition-metal alloys is presented. It is shown that by using a rectangular shape of the d-band density of states, with bandwidth, band center, and band filling as only input parameters, segregation can be predicted for any transition-metal binary alloy (702 systems). Comparing with the systems measured experimentally (36) we find a good agreement (90%). The cases in disagreement involve magnetic elements. This theory allows also the calculation of the surface segregation in the whole concentration range, as a function of temperature. © 1987.

Official source

https://infoscience.epfl.ch/entities/publication/6fa771ad-98b7-4393-bb89-3a650a529cc9

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1987

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6fa771ad-98b7-4393-bb89-3a650a529cc9

About this result

Related concepts (32)

Electronic band structure

In solid-state physics, the electronic band structure (or simply band structure) of a solid describes the range of energy levels that electrons may have within it, as well as the ranges of energy that they may not have (called band gaps or forbidden bands). Band theory derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or molecules.

Alloy

An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductility, opacity, and luster, but may have properties that differ from those of the pure metals, such as increased strength or hardness. In some cases, an alloy may reduce the overall cost of the material while preserving important properties.

Transition metal

In chemistry, a transition metal (or transition element) is a chemical element in the d-block of the periodic table (groups 3 to 12), though the elements of group 12 (and less often group 3) are sometimes excluded. The lanthanide and actinide elements (the f-block) are called inner transition metals and are sometimes considered to be transition metals as well. Since they are metals, they are lustrous and have good electrical and thermal conductivity.

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