Microscopic work function anisotropy and surface chemistry of 316L stainless steel using photoelectron emission microscopy

Abstract : We have studied the variation in the work function of the surface of sputtered cleaned 316L stainless steel with only a very thin residual oxide surface layer as a function of grain orientation using X-ray photo-electron emission microscopy (XPEEM) and Electron Backscattering Diffraction. The grains are mainly oriented [1 1 1] and [1 0 1]. Four distinct work function values spanning a 150 meV energy window are measured. Grains oriented [1 1 1] have a higher work function than those oriented [1 0 1]. From core level XPEEM we deduce that all grain surfaces are Cr enriched and Ni depleted whereas the Cr/Fe ratio is similar for all grains. The [1 1 1] oriented grains show evidence for a Cr 2 O 3 surface oxide and a higher concentration of defective oxygen sites.
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N. Barrett, O. Renault, H. Lemaître, P. Bonnaillie, F. Barcelo, et al.. Microscopic work function anisotropy and surface chemistry of 316L stainless steel using photoelectron emission microscopy. Journal of Electron Spectroscopy and Related Phenomena, Elsevier, 2014, 195, pp.117 - 124. ⟨10.1016/j.elspec.2014.05.015⟩. ⟨cea-01376760⟩

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