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キーワード:
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要旨:
The periodic and intrinsic defect structure of the (1 × 2) missing-row reconstructed Pt(110) and Au(110) surfaces was investigated by scanning tunneling microscopy. From the formation of extended, defect-free (1 × 2) domains, this phase is identified as the energetically most stable one for the clean surfaces. Structural defects such as steps were found to interact with the reconstruction. The stabilization of (111) microfacets, at step edges, is found as a general principle governing the step terrace topography of these surfaces. The presence of trace impurities is correlated with an increase of (1 × 3) structural units along the [1¯10] direction, leading at first to a decrease in (1 × 2) domain size and, at higher densities, to structures such as (1 × 7), (1 × 5) and finally a (1 × 3), which exhibit periodic arrangements of (1 × 3) units as the common building principle. The (1 × 3) troughs, with third-layer metal atoms missing as well, are equally formed by (111) microfacets.
