Bikondoa, Oier; Moritz, Wolfgang; Torrelles, Xavier; Kim, H.J.; Thornton, G.; Lindsay, R.
Impact of ambient oxygen on the surface structure of α -Cr 2 O3 (0001 ).
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 20
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Surface x-ray diffraction has been employed to quantitatively assess the surface structure of α -Cr2 O3 (0001) as a function of oxygen partial pressure at room temperature. In ultrahigh vacuum, the surface is found to exhibit a partially occupied double layer of chromium atoms. At an oxygen partial pressure of 1× 10-2 mbar, the surface is determined to be terminated by chromyl species (CrO), clearly demonstrating that the presence of oxygen can significantly influence the structure of α -Cr2 O3 (0001).