Auger electron spectroscopic study of CO2 adsorption on Zircaloy-4 surfaces

• Published in: Applied surface science Vol. 254; no. 9; pp. 2866 - 2870
• Main Authors: STOJILOVIC, N, FARKAS, N, RAMSIER, R. D
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Science 28.02.2008
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Physics; Zry-4; Inorganic compounds; Graphitic carbon; CO2; Carbon; Carbidic carbon; Carbon oxides; AES
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2007.10.028

We investigate the adsorption of CO2 onto Zircaloy-4 (Zry-4) surfaces at 150, 300 and 600K using Auger electron spectroscopy (AES). Following CO2 adsorption at 150K the graphitic form of carbon is detected, whereas upon chemisorption at 300 and 600K we detect the carbidic phase. As the adsorption temperature is increased, the carbon Auger signal increases, whereas the oxygen signal decreases. Adsorption at all three temperatures results in a shift of the Zr Auger features, indicating surface oxidation. The effect of adsorbed CO2 on the Zr(MVV) and Zr(MNV) transitions depends on adsorption temperature and is less pronounced at higher temperatures. On the other hand, changes in the Zr(MNN) feature are similar for all three adsorption temperatures. The changes in the Zr Auger peak shapes and positions are attributed to oxygen from dissociated CO2, with the differences observed at various temperatures indicative of the diffusion of oxygen into the subsurface region.