Abstract
The surface compositions of five sputter-cleaned zirconium-nickel intermetallic compounds (ZrNi 5, Zr 2Ni 7, ZrNi 3, ZrNi, and Zr 2Ni) have been estimated by quantitative Auger analysis. The quantitative analysis was calibrated using Auger intensities measured on UHV fracture exposed alloy surfaces. The five sputter-cleaned alloys are slightly enriched in surface Zr relative to their bulk compositions. Their initial oxidation at room temperature is accompanied by the preferential surface accumulation of oxidized Zr. We have previously shown that the oxidation of Zr 2Ni 7, ZrNi 3, and ZrNi at 673 K results in the preferential surface accumulation of oxidized Ni. This variation with temperature of the surface compositional stratification and preferential oxidation characteristics of Zr-Ni alloys can have a significant influence on their stability in oxidizing environments.
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