Abstract
Abstract Electron energy loss spectroscopy has been used to investigate the average oxidation state of Cr in both electrochemically and chemically delithiathed Li 5/3− x Ti 7/3 CrO 7 . The O K edge, Ti L 2,3 and Cr L 2,3 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 (Cr 2 O 3 , CrO 2 and K 2 Cr 2 O 7 ) 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 Cr 2 O 3 and CrO 2 makes the valence analysis difficult in Li 5/3− x Ti 7/3 CrO 7 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 .
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
