Vibrational entropy-driven dealloying of Mo(1 0 0) and W(1 0 0) surface alloys |
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Authors: | K.L. Man |
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Affiliation: | Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong |
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Abstract: | The formation and stability of Cu, Ag and Au-induced c(2 × 2) alloys at the Mo(1 0 0) and W(1 0 0) surfaces have been investigated with low-energy electron microscopy and diffraction. The ordered alloys transform to disordered overlayer structures at elevated temperature. Comparison of the transformation temperatures with energetics obtained from first principles calculations reveals the vibrational entropic contribution to the system free energy that defines alloy thermal stability. Effective Debye temperatures for metal adatoms are determined that exhibit the expected mass and bond strength dependence. |
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Keywords: | Bimetallic surfaces Surface thermodynamics Surface structure, morphology, roughness, and topography Low-energy electron microscopy (LEEM) Low-energy electron diffraction (LEED) Molybdenum Tungsten |
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