Diaz-Carrasco, P., Moreau, P., Guyomard, D., Kuhn, A. & Garcia-Alvarado, F. (2006) Electron energy loss spectroscopy analysis of lithium deintercalated Li5/3-xTi7/3CrO7. J. Phys. Chem. Solids, 67 1295–1298.
Added by: Florent Boucher (2016-05-12 13:21:37)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0022-3697
Clé BibTeX: DiazCarrasco2006
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Créateurs: Diaz-Carrasco, Garcia-Alvarado, Guyomard, Kuhn, Moreau
Collection: J. Phys. Chem. Solids
Consultations : 8/351
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Electron energy loss spectroscopy has been used to investigate the average oxidation state of Cr in both electrochemically and chemically delithiathed Li5/3-xTi7/3CrO7. The O K edge, Ti L-2,L-3 and Cr L-2,L-3 edge were monitored. Upon removal of Li ions, the oxygen K edge shows a continuous change while the Cr L edges remain almost unchanged. The Cr 2p multiplet was compared with reference samples (Cr2O3, CrO2 and K2Cr2O7) in order to assess on the sensitivity of the Cr L-edge to the oxidation state of chromium ion. The similarity between the Cr L spectra of Cr2O3 and CrO2 makes the valence analysis difficult in Li5/3-xTi7/3CrO7 but the presence of Cr-VI is excluded in oxidized samples. However, evolution of the low energy loss spectra observed in the 10-15 eV region confirms the modification of the electronic structure and partial oxidation of Cr-III to Cr-IV. (c) 2006 Elsevier Ltd. All rights reserved.
Added by: Florent Boucher