Abstract
An ordered alloy surface of Pt 3Co(100) has been studied by low energy electron diffraction (LEED), Auger electron spectroscopy (AES), thermal desorption spectroscopy (TDS) and temperature programmed reaction (TPR). The clean surface exhibited a c(2 × 2) LEED structure, when the sample was carefully annealed at temperatures lower than the critical temperature for order-disorder transition of the bulk. With NO adsorption, the surface structure was reconstructed to a (1 × 1) LEED structure and was changed back to the c(2 × 2) structure by reaction with hydrogen at 500 K. From the results of LEED and AES studies combined with the H 2 + D 2 → 2HD reaction, it was deduced that the reconstructed (1 × 1) surface is terminated by a Pt-enriched layer, and that the clean c(2 × 2) surface reveals an ordered PtCo outmost layer. Furthermore, compared with the reaction of N 2O and the adsorption of nitrogen activated by high frequency discharge, it was shown that the surface reconstruction originated from adsorbed surface nitrogen and not from surface oxygen.
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