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• W2047408980 startingPage "7867" @default.
• W2047408980 abstract "Low-energy electron diffraction (LEED) is used for measuring the surface segregation and multilayer relaxation on the (110) surface of the ${mathrm{Pt}}_{0.5}$${mathrm{Ni}}_{0.5}$ alloy. The electron scattering in the substitutionally disordered metallic alloy is described by a layer-by-layer version of the averaged-t-matrix approximation, LEED is calculated by the layer-doubling method (whose convergence is verified), and the measured and calculated spectra are compared by means of metric distances. We find that surface segregation creates a three-layer surface sandwich which has, from the crystal face and inwards, the compositions 100 at. % Ni, 95 at. % Pt, and 83 at. % Ni and the respective multilayer relaxations 19% contraction, 11% expansion, and 1% contraction. The fact that the surface segregation on the (110) face is reversed relative to that which was observed earlier on the (111) face (from the surface and inwards, 88 at. % Pt and 91 at. % Ni) presents a challenge to the theory of alloys. We also discuss the possibility to measure surface vacancy defects by LEED." @default.
• W2047408980 created "2016-06-24" @default.
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• W2047408980 date "1987-05-15" @default.
• W2047408980 modified "2023-10-17" @default.
• W2047408980 title "Surface-sandwich segregation and multilayer relaxation on<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Pt</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>0.5</mml:mn></mml:mrow></mml:msub></mml:…" @default.
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• W2047408980 doi "https://doi.org/10.1103/physrevb.35.7867" @default.
• W2047408980 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9941115" @default.
• W2047408980 hasPublicationYear "1987" @default.
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