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Oxidation of polycrystalline Ni studied by spectromicroscopy: Phase separation in the early stages of crystallite growth

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Cornish, A., Eralp, T., Shavorskiy, A., Bennett, R. A., Held, G. F. K., Cavill, S.A., Potenza, A., Marchetto, H. and Dhesi, S.S. (2010) Oxidation of polycrystalline Ni studied by spectromicroscopy: Phase separation in the early stages of crystallite growth. Physical Review B, 81 (8). 085403. ISSN 1098-0121

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To link to this article DOI: 10.1103/PhysRevB.81.085403

Abstract/Summary

Low-energy and photoemission electron microscopy enables the determination of facet planes of polycrystalline surfaces and the study of their chemical composition at the sub-m scale. Using these techniques the early oxidation stages of nickel were studied. After exposing the surface to 20 L of oxygen at 373 K a uniform layer of chemisorbed oxygen was found on all facets. After oxygen exposure at 473–673 K, small NiO crystallites are formed on all facets but not in the vicinity of all grain boundaries. The crystallites are separated by areas of bare Ni without significant oxygen coverage.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:15532
Publisher:American Physical Society

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