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Electron Spectroscopic Study of Surface Segregation and Oxidation of Cu-In and Cu-Au Alloys

Kumar, Sampath TS and Hegde, MS (1986) Electron Spectroscopic Study of Surface Segregation and Oxidation of Cu-In and Cu-Au Alloys. In: Applied Surface Science, 26 (2). pp. 219-229.

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Abstract

XPS and AES techniques were employed to study the surface segregation and oxidation of Cu-1at%In alloy. Surface segregation of In has been observed with an enthalpy of segregation of about −34 kJ/mol. The surface oxidation of the Cu-In alloy at 480 K showed first a formation of $Cu_2O$ on the alloy surface. The displacement reaction $3Cu_2O + 2In \rightarrow 6Cu + In_2O_3$ occurred on the alloy surface, on further heating of the oxidized surface in vacuum at 700 K. XPS and UPS techniques were employed to study the oxygen interaction with Cu-5at%Au and Cu-11at%Au alloys. At 300 K, oxygen was dissociatively chemisorbed on the Cu sites of the Cu-11% Au alloy surface, and the oxygen desorbed on heating. TDS study showed that desorption follows second order kinetics with an activation energy of desorption of about 75 kJ/mol.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 24 Jun 2008
Last Modified: 19 Sep 2010 04:46
URI: http://eprints.iisc.ernet.in/id/eprint/14631

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