Changes in electronic structure upon lithium insertion reaction into the A-site-deficient perovskite-type oxides, Gd 1/3TaO 3: Part 1. XAS measurements

Abstract

Electrochemical behavior and the variation of electronic structure upon lithium insertion into the A-site-deficient perovskite oxide, Gd 1/3TaO 3, have been studied by X-ray absorption spectroscopy (XAS). During electrochemical lithium insertion, Gd L III-edge and Ta L I-edge XAS revealed that Gd ion did not contribute the charge compensation, while Ta ion reduced its oxidation state. Furthermore, the changes in O K-edge spectra with electrochemical lithium insertion were clearly observed, indicating that O ions also contribute to the electron-transfer reaction.