PHASE TRANSITIONS ON ALLOY SURFACES

Y. Teraoka
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Y. Teraoka: Department of Materials Science, College of Integrated Arts and Sciences, University of Osaka Prefecture, Sakai 593, Japan

Surface Review and Letters (SRL), 1996, vol. 03, issue 05n06, 1791-1809

Abstract: Various kinds of quasi-two-dimensional order-disorder phase transitions on binary alloy surfaces are discussed on the basis of the lattice gas model with appropriate approximations. The importance of surface segregation is pointed out in understanding phase transitions on alloy surfaces. Ordered structures localized on the surfaces are found above the bulk transition temperature, and a possibility of finding surface ordered structures with a different symmetry from the bulk ordered one is discussed, too. As for both ordering and segregating alloys, semi-infinite systems with surfaces are discussed above and below the bulk transition temperatures; in particular, the relation of the surface phase transitions to the bulk ones is focused on.

Date: 1996
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DOI: 10.1142/S0218625X96002734

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