Surface structure of γ-Fe2O3(111)

Bowker, Michael; Hutchings, Graham; Davies, Philip R.; Edwards, Dyfan; Davies, Robert; Shaikhutdinov, Shamil Kamilovich; Freund, Hans-Joachim

doi:10.1016/j.susc.2012.06.010

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Surface structure of γ-Fe₂O₃(111)

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Shaikhutdinov, Shamil Kamilovich
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund, Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Bowker, M., Hutchings, G., Davies, P. R., Edwards, D., Davies, R., Shaikhutdinov, S. K., et al. (2012). Surface structure of γ-Fe₂O₃(111). Surface science, 606(21-22), 1594-1599. doi:10.1016/j.susc.2012.06.010.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0010-2125-B

Abstract

The surface structure of γ-Fe₂O₃(111) has been investigated with a range of surface techniques. Two different surface structures were discovered depending upon surface preparation techniques. Sputtering followed by annealing in vacuum produced a reduced surface characterised by a (2 × 2) LEED pattern, whereas sputtering followed by annealing in 1 × 10⁻⁶ mbar oxygen produced a surface characterised by a (√3 × √3)-R30° LEED pattern. The latter appears to be a very low conductivity surface, whereas the former has the band gap expected for maghemite (~ 2.0 eV). We propose that the reduced surface is a magnetite-like layer, whereas the oxidised surface is an Fe₂O₃-like layer.