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- W2012178005 abstract "The surface composition of two Pt/Sn alloys, viz. PtSn and Pt3Sn, has been followed by means of AES, as a function of annealing in ultrahigh vacuum, oxygen chemisorption and reduction with hydrogen. The results, which were quantitatively interpreted with the aid of a novel calibration technique, reveal the following features: - The surface of PtSn and Pt3Sn becomes enriched with tin by annealing in vacuum. Ultimate values of 68±5 at% Sn for PtSn and 41±5 at% Sn for Pt3Sn were attained after annealing at 500°C. - The adsorption of oxygen on the annealed surface of PtSn and Pt3Sn causes a further enrichment with tin, while severe oxidation of PtSn at 500°C leads to complete disappearance of Pt from the surface. - Oxygen is more strongly and differently bound on a surface containing about 40 at% Sn than on a surface containing about 70 at% Sn. Activated adsorption of oxygen takes place only on the latter. The results suggest the formation of SnO2 surface complexes on the exposed surface of Pt3Sn. - Reduction of the alloys at 500°C carries the excess of tin into the bulk and reduces its surface concentration to 35±5 at% for Pt3Sn and 64±5 at% for PtSn, which is an enrichment of the surface with platinum relative to the annealed state." @default.
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- W2012178005 date "1973-03-01" @default.
- W2012178005 modified "2023-09-26" @default.
- W2012178005 title "Auger spectroscopic study of the surface composition of Pt/Sn alloys in ultrahigh vacuum and in the presence of oxygen and hydrogen" @default.
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- W2012178005 doi "https://doi.org/10.1016/0039-6028(73)90200-8" @default.
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