Electronic structure and x-ray spectra of defective oxides LixCoO2

X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6 <= x <= 1.0). Resonant O K alpha x-ray emission spectra of LiCoO2 showed localized excitonic states due to a dd transition between unoccupi...

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Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-07, Vol.74 (4), p.045120
Main Authors: Galakhov, V. R., Ovechkina, N. A., Shkvarin, A. S., Shamin, S. N., Kurmaev, E. Z., Kuepper, K., Takacs, A. F., Raekers, M., Robin, S., Neumann, M., Gavrila, G. N., Semenova, A. S., Kellerman, D. G., Käämbre, Tanel, Nordgren, Joseph
Format: Article
Language:English
Subjects:
Fysik
NATURAL SCIENCES
NATURVETENSKAP
Physics
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Summary:X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6 <= x <= 1.0). Resonant O K alpha x-ray emission spectra of LiCoO2 showed localized excitonic states due to a dd transition between unoccupied and occupied Co 3d states. On the basis of measurements of Co 3s x-ray photoelectron and Co 2p and O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are localized mainly in O 2p states. Evidence of phase separation in LixCoO2 has been found.
ISSN:1550-235X
1098-0121
DOI:10.1103/PhysRevB.74.045120