X-ray scattering study of the stoichiometric recovery of the a-Fe2O3(0001) surface
نویسندگان
چکیده
The stoichiometric recovery and accompanying changes of subsurface atomic structure of Ar ion sputtered, oxygen deficient a-Fe2O3(0001) are studied with X-ray scattering. Although oxygen annealing up to 735 C results in a stoichiometric top surface layer manifested as a (1 · 1) surface structure, the X-ray scattering reveals the existence of a non-stoichiometric phase in the subsurface region. The non-stoichiometric region is characterized as a remnant of Fe3O4 or c-Fe2O3. The stoichiometric outmost surface layers act as a barrier for propagation of oxidation to underneath remnant phase. The remnant phase can be removed after annealing at a higher temperature. 2004 Elsevier B.V. All rights reserved.
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