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Ferrero, S.
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article
Ordered overlayers of Ca on TiO2(110)-1×1
Abstract
<p>Scanning tunneling microscopy (STM) and low-energy electron diffraction (LEED) have been used to examine the structure of ordered adlayers of Ca on TiO<sub>2</sub>(110)-1 × 1 formed by metal vapor deposition. A comparison is made with structures formed by segregation of Ca from the bulk, with similar structures being found for the two preparation methods below a monolayer coverage. At low coverages, rows of width ∼0.6-0.9 nm develop in the [110] and [001] azimuths. At coverages equivalent to a single calcium layer, a c(6×2) overlayer is formed. At coverages above a single layer, a disordered structure develops and a LEED pattern with (<sup>2</sup> -0.1 1 <sup>0</sup>) symmetry is observed.</p>