Surface segregation and oxidation studies on Cu-Ni-Sn and Ag-Cu-Ge ternary alloys

Kumar, Sampath TS and Mallya, RM and Hegde, MS (1988) Surface segregation and oxidation studies on Cu-Ni-Sn and Ag-Cu-Ge ternary alloys. In: Applied Surface Science, 35 (1). pp. 63-75.

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Abstract

Surface segregation and oxidation of Cu-9.7at%Ni-2.3at%Sn and Ag-39at%Cu-1.6at%Ge ternary alloys have been carried out employing XPS and AES techniques. Segregation of both Ni and Sn have been observed on the surface of Cu-Ni-Sn alloy. On oxidation of this alloy at 500 K, $Cu_2O$, NiO and SnO have been observed and on heating the oxidized alloy in vacuum to 600 K, $Cu_2O$ was reduced to Cu through a displacement reaction involving Ni. Further heating to 750 K showed only $SnO_2$, along with the reduction of NiO to Ni. The Ag-Cu-Ge alloy showed segregation of both Ag and Ge to the surface. On oxidation at 500 K, only $Cu_2O$ and GeO have been observed. Heating of the oxidized surface to 700 K in vacuum showed desorption of GeO, coupled with the reduction of $Cu_2O$ to Cu. thereby leaving the alloy surface clean.

Item Type:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	20 Feb 2008
Last Modified:	19 Sep 2010 04:42
URI:	http://eprints.iisc.ac.in/id/eprint/13072

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