Electronic structure and x-ray spectra of defective oxides LixCoO2

Autor(en): 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.
Kaambre, T.
Nordgren, J.
Stichwörter: ABSORPTION SPECTROSCOPY; EDGE; EMISSION; LACOO3; LICOO2; Materials Science; Materials Science, Multidisciplinary; NACO2O4; PHOTOELECTRON; Physics; Physics, Applied; Physics, Condensed Matter; TRANSITION
Erscheinungsdatum: 2006
Herausgeber: AMERICAN PHYSICAL SOC
Enthalten in: PHYSICAL REVIEW B
Band: 74
Ausgabe: 4
Zusammenfassung: 
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: 10980121
DOI: 10.1103/PhysRevB.74.045120

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