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Reducing the V2O3(0001) surface through electron bombardment – a quantitative structure determination with I/V-LEED

MPS-Authors
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Feiten,  Felix E.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Kuhlenbeck,  Helmut
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

Feiten, F. E., Kuhlenbeck, H., & Freund, H.-J. (2016). Reducing the V2O3(0001) surface through electron bombardment – a quantitative structure determination with I/V-LEED. Physical Chemistry Chemical Physics, 18(4), 3124-3130. doi:10.1039/C5CP07390A.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0029-64F8-D
Abstract
The (0001) surface of vanadium sesquioxide, V2O3, is terminated by vanadyl groups under standard ultra high vacuum preparation conditions. Reduction with electrons results in a chemically highly active surface with a well-defined LEED pattern indicating a high degree of order. In this work we report the first quantitative structure determination of a reduced V2O3(0001) surface. We identify two distinct surface phases by STM, one well ordered and one less well ordered. I/V-LEED shows the ordered phase to be terminated by a single vanadium atom per surface unit cell on a quasi-hexagonal oxygen layer with three atoms per two-dimensional unit cell. Furthermore we compare the method of surface reduction via electron bombardment with the deposition of V onto a vanadyl terminated film. The latter procedure was previously proposed to result in a structure with three surface vanadium atoms in the 2D unit cell and we confirm this with simulated STM images.