SEGREGATION PROFILES IN CU3AU ABOVE THE ORDER-DISORDER TRANSITION

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Mecke K
Zeitschrift: Physical Review B
Verlag: AMERICAN PHYSICAL SOC
Jahr der Veröffentlichung: 1995
Band: 52
Heftnummer: 3
Seitenbereich: 2107-2116
ISSN: 0163-1829


Abstract

The segregation at a (100) surface of Cu3Au is studied slightly above the order-disorder transition at T-c. Based on a semi-infinite lattice-gas model with nearest- and next-nearest-neighbor interactions, we find within mean-field theory that close to the surface and in the disordered phase the Au concentration decays exponentially towards its bulk value. The corresponding decay length Lambda increases as (T-T-sp)(-1/2) upon approaching T-c, where T-sp < T-c denotes the spinodal temperature of the order-disorder transition. Without using any adjustable parameters, we obtain theoretical predictions in good quantitative agreement with recent x-ray-scattering data from this surface.


FAU-Autoren / FAU-Herausgeber

Mecke, Klaus Prof. Dr.
Lehrstuhl für Theoretische Physik

Zuletzt aktualisiert 2018-06-08 um 23:46