Abstract
The electronic structure of Co2O3 and LiCoO2 is analyzed in a comparative study employing synchrotron radiation. We study the Co2p and O1s core levels, the X-ray absorption spectra at the Co2p and O1s absorption edges, as well as the valence band and conduction band states of Co2O3 and LiCoO2 by resonant photoelectron spectroscopy. We notice a metallic behavior of Co2O3 while LiCoO2 has a gap. We discuss our data in terms of a band diagram in which localized states around the Fermi energy are within the gap formed from covalent O2p-Co3d contributions.
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