A LEED study of UO2(~100) vicinal surfaces |
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Authors: | TN Taylor WP Ellis |
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Institution: | University of California, Los Alamos Scientific Laboratory, LosAlamos, New Mexico 87545, USA |
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Abstract: | The ordering and faceting properties of UO2(~100) vicinal surfaces have been studied via LEED and Auger measurements. The measurements have demonstrated a reduced tendency for step ordering on UO2(~100) vicinal surfaces when compared to step ordering on UO2(~111) vicinal surfaces. The UO2(~100) vicinal surfaces were observed to decompose irreversibly into low-index facets, including prominent (100) facets, at temperatures below those needed for creation of lowest index faceting on UO2(~111) vicinal surfaces. These properties suggest that (100) terraces, in contrast to (111) terraces, act as surface diffusion barriers that limit longrange surface communication while growing at the expense of intermediate faceting stages. |
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