Cu-Sn (100) 合金表面のLEED図形観察

概要

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Alloy surfaces of Cu-Sn(100) are prepared by depositing tin onto copper (100) surface and subsequent heat treatments. The surface structure of them is investigated by LEED. After depositing of tin, c(2×2), (3√2×√2) R45° and c(3×2) + (2×2) structures have been obtained as the heat treatments proceed. These are characteristic structures which are not expected from the atomic arrangement of the sections of the bulk crystals of equilibrium phase.<BR>A 1.1 at%Sn-Cu bulk crystal is grown by the Bridgman method. The (100) surface structure of the alloy crystal at equilibrium state is investigated by LEED. Excellent LEED patterns of the (3√2×√2) R45 ° structure are observed on the surface.<BR>Structure models corresponding to the LEED patterns are given.
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