Reconstructions of Au films on Pd(110)
摘要：
We present a study of thermally activated changes in Au films, 1–10 monolayers thick, on Pd(110). The films are stable against bulk dissolution until 500 K, based upon Auger electron spectroscopy. For Au coverages below 1.5 monolayers, only a (1×1) overlayer structure is observed with low-energy electron diffraction over the entire temperature range studied (130–800 K). At coverages above 1.0 monolayers and after annealing to temperatures above 300 K, a (1×z) diffraction pattern develops. With increasing coverage the value of z increases continuously from 2 to 3, reaching z=3 at 4 monolayers. We propose that the diffraction pattern reflects a coverage-dependent mixture of small domains of (1×2) and (1×3) reconstruction, with the (1×2) favored at low coverage and the (1×3) favored at high coverage. This model is rationalized in terms of the film's coverage-dependent morphology, which can be described as Stranski-Krastanov with a critical thickness of 2 monolayers.
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DOI：
10.1103/PhysRevB.43.8834
被引量：
年份：
1991
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