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Controlling Oxidation States in Uranium Oxides through Epitaxial Stabilization


  • This work was supported as a Los Alamos National Laboratory Directed Research and Development Project under the United States Department of Energy. It was also partially supported by the US Department of Energy, Office of Science, Materials Science and Engineering Division, and LANL Campaign II MTE 2.1. The UO2 single crystal samples were provided by Mark Paffett. The photoemission work was conducted at the Synchrotron Radiation Center, University of Wisconsin-Madison, which is supported by the NSF under Award # DMR-0537588.


We have demonstrated that oxidation states in uranium-oxides such as UO2 and U3O8 can be controlled through epitaxial stabilization by growing single-crystal-like films. We have further shown that the growth of polymorphic uranium oxides is feasible by using different substrates with appropriate in-plane lattice parameters. The clearly improved stability of epitaxial uranium-oxides illustrates the significance of crystal lattice pinning on the control of surface chemistry of materials.

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