Abstract
The (110) surface of uranium dioxide (UO 2+ x ) single crystals has been studied by elevated-temperature scanning tunneling microscopy (STM). STM images of stoichiometric UO 2(110) surfaces display a row structure which corresponds to a (1×1) bulk termination with missing rows along the [1 1 ̄ 0] direction. Uranium sites are visible with atomic resolution in empty-states images above ∼1.6 V sample bias. Interstitial oxygen in hyperstoichiometric UO 2+ x leads to a local redistribution of charge which appears in the STM image as dimer pairs. After dosing a UO 2(110) surface with oxygen, another type of superstructure was observed which results from oxygen adsorption at surface interstitial sites.
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