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

DOI: 10.1103/PhysRevB.81.085403 DOI Help

Authors: Alix Cornish (University of Reading) , Tugce Eralp (University of Reading) , Andrey Shavorskiy (University of Reading) , Georg Held (University of Reading) , Stuart Cavill (University of York, Diamond Light Source) , Alessandro Potenza (Diamond Light Source) , Helder Marchetto (Diamond Light Source) , Sarnjeet Dhesi (Diamond Light Source) , Roger Bennett (University of Reading)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 81 (8) , PAGES 085403

State: Published (Approved)
Published: February 2010

Abstract: 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-μm 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.

Subject Areas: Physics


Instruments: I06-Nanoscience