Abstract
Some surfaces reconstruct by changing their morphology such that new surface orientations are being exposed. From general considerations it is clear that the surface free energy of such a reconstructed surface will be lower than that of the non-reconstructed form. It can be shown, however, that surface reconstruction will only be energetically favorable if the anisotropy of the surface free energy in the orientational range involving the non-reconstructed surface is high. Two different experiments carried out on Pt{110} support this idea. Measurements of surface self-diffusion on Pt{110} in the 〈001〉 direction are consistent with an anisotropy in surface free energy, γ(θ) of 8–10% at T > 1400 K. Spectroscopic data of surface atom core level shifts (SCLS) of clean reconstructed and non-reconstructed Pt surfaces also yield anisotropics of γ(θ) in excess of 10% along the [11̄0] zone. Reconstruction of the Pt{110} surface to the 1×2 lowers that anisotropy drastically. Measurements of SCLS of CO-covered Pt surfaces are also evaluated in terms of changes in γ(θ). It is found that CO adsorption moves the lowest energy cusp from {111} to {110}, and further that the non-reconstructed {110} is more stable than the reconstructed surface. This explains why CO lifts the 1×2 reconstruction of Pt {110}.
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Bonzel, H.P., Dückers, K. (1988). Relationship Between Anisotropy of Specific Surface Free Energy and Surface Reconstruction. In: Vanselow, R., Howe, R. (eds) Chemistry and Physics of Solid Surfaces VII. Springer Series in Surface Sciences , vol 10. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-73902-6_15
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DOI: https://doi.org/10.1007/978-3-642-73902-6_15
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