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Abstract:
Polar oxide (111) surfaces are prepared on thin films of NiO, CoO and FeO. In the limit of completely ionic rock salt type crystal structures these (111) surfaces, whether they are oxygen or metal terminated, show a tendency for reconstruction. We show that the unreconstructed polar surfaces are OH covered, and, after OH removal, the surface reconstructs. We show that this is true for NiO(111). For CoO(111) the stability of the oxide film does not allow the removal of OH, so that the reconstruction cannot be observed. The FeO(111) surface is permanently reconstructed and we show that for FeO(111) grown on Fe(110) the surface is not of Fe3O4(111) type.
