X-ray absorption study of the electronic structure of Li-excess spinel Li1+xTi2-xO4 (0≤x≤0.33)

Wonkyung Ra; Nakayama, Masanobu; Ikuta, Hiromasa; Uchimoto, Yoshiharu; Wakihara, Masataka
May 2004
Applied Physics Letters;5/31/2004, Vol. 84 Issue 22, p4364
Academic Journal
Li-excess spinel oxide, Li1+xTi2-xO4 (0≤x≤0.33), was investigated by x-ray absorption spectra (XAS) technique. XAS results revealed that both oxygen and titanium ions affect electronic structural changes in the system. Early transition metal compounds are considered to have smaller d–d Coulomb correlation energy (Udd) than p–d Charge-transfer energy (Δ), indicating that electronic transfer for charge compensation occurs mainly on transition metal. However, present XAS results show that considerable charge-transfer character due to strong hybridization between titanium 3d and oxygen 2p orbitals exists in this early transition metal oxide system. © 2004 American Institute of Physics.


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