You can use the filter on the left to narrow the results
Previous
Type
All Books Papers
Title
Author
Keywords
ISBN
DOI Access
CSIC digital access
Search
Details
PublicationPhysical Review Letters
Year2011
Volume106
Pages246801
International

Electron Localization in Defective Ceria Films: A Study with Scanning-Tunneling Microscopy and Density-Functional Theory

Authors:Jan-Frederik Jerratsch , Xiang Shao , Niklas Nilius , H.-J. Freund , Cristina Popa , María Verónica Ganduglia Pirovano, Asbjoern M. Burow , J. Sauer
Groups of research:Modeling for Theoretical Catalysis
Scanning-tunneling microscopy and density-functional theory have been employed to identify the spatial correlation between an oxygen vacancy and the associated Ce(3+) ion pair in a defective CeO(2)(111) film. The two Ce(3+) ions can occupy different cationic shells around the vacancy. The resulting variation in the chemical environment leads to a splitting of the filled Ce(3+) f levels, which is detected with STM spectroscopy. The position of the Ce(3+) ion pair is reflected in characteristic defect patterns observed in empty-state STM images, which arise from the bright appearance of Ce(4+) ions next to the defect while the Ce(3+) remain dark. Both findings demonstrate that at least one excess electron localizes in a Ce ion that is not adjacent to the O vacancy.
Keywords:SURFACES, NANOPARTICLES, MORPHOLOGY, CATALYSTS, GOLD, CEO2
logo de CSIC