Journal
SURFACE SCIENCE
Volume 609, Issue -, Pages 67-72Publisher
ELSEVIER
DOI: 10.1016/j.susc.2012.11.005
Keywords
Oxide surface; Scanning tunneling microscopy; Iron oxides; Surface phases; Annealing treatment
Categories
Funding
- 973 Program of China [2012CB921700]
- NSFC [11027406]
- Beijing Municipal Commission of Education
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By using scanning tunneling microscopy (STM), we study the structure of the (0001) surface of hematite (alpha-Fe2O3) prepared by ultra-high vacuum treatment. The surface is reduced into a Fe3O4(111) phase by Ar ion sputtering followed by annealing in vacuum, while it is oxidized to a honeycomb superstructure by annealing in O-2. High-resolution STM images reveal that the O-terminated FeO(111), Fe- and O-terminated Fe2O3(0001) domains coexist with each other in the superstructure. Unlike the reduction of Fe2O3(0001) whose depth increases with repeated annealing in vacuum, the oxidation of Fe3O4(111) occurs only partially on the top layers by annealing in O-2. (C) 2012 Elsevier B.V. All rights reserved.
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