Hydrated α-Fe2O3 surface structure: Role of surface preparation
| Autor: | Peter J. Eng, Jeffrey G. Catalano, Sanjit Ghose, Sarah C. Petitto, Kunaljeet Tanwar, Thomas P. Trainor |
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| Rok vydání: | 2007 |
| Předmět: |
Diffraction
Materials science Annealing (metallurgy) Iron oxide Polishing Surfaces and Interfaces Hematite Condensed Matter Physics Surfaces Coatings and Films Crystal Crystallography chemistry.chemical_compound chemistry visual_art Materials Chemistry visual_art.visual_art_medium Stoichiometry Ambient pressure |
| Zdroj: | Surface Science. 601:L59-L64 |
| ISSN: | 0039-6028 |
| Popis: | The surface structure of α- Fe 2 O 3 ( 1 1 ¯ 0 2 ) was studied under two different surface preparation conditions using crystal truncation rod (CTR) diffraction. Wet chemical and mechanical polishing (CMP) at 298 K results in a crystalline surface termination in which the top layer of iron atoms is absent compared to the stoichiometric bulk termination. Annealing in air at 773 K resulted in a transformation of the surface to a structure consistent with hydroxylation of the stoichiometric termination. These results agree with theoretical predictions of Lo et al. [C.S. Lo, K.S. Tanwar, A.M. Chaka, T.P. Trainor, Phys. Rev. B 75 (2007) 075425] and clearly show an ambient pressure surface preparation path leading to a stoichiometric hydroxylated surface, which is apparently a meta-stable configuration at room temperature. |
| Databáze: | OpenAIRE |
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