title: Temperature dependence of pre-edge features in Ti K-edge XANES spectra for ATiO₃ (A = Ca and Sr), A₂TiO₄ (A = Mg and Fe), TiO₂ rutile and TiO₂ anatase.
abstract: XANES (X-ray absorption near-edge structure) spectra of the Ti K-edges of ATiO3 (A = Ca and Sr), A2TiO4 (A = Mg and Fe), TiO2 rutile and TiO2 anatase were measured in the temperature range 20-900 K. Ti atoms for all samples were located in TiO6 octahedral sites. The absorption intensity invariant point (AIIP) was found to be between the pre-edge and post-edge. After the AIIP, amplitudes damped due to Debye-Waller factor effects with temperature. Amplitudes in the pre-edge region increased with temperature normally by thermal vibration. Use of the AIIP peak intensity as a standard point enables a quantitative comparison of the intensity of the pre-edge peaks in various titanium compounds over a wide temperature range.
authors.affiliation: Graduate School of Sciences and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Hiratoko
authors.forename: Akira
authors.initials: A
authors.lastname: Yoshiasa
authors.forename: Tomotaka
authors.initials: T
authors.lastname: Nakatani
authors.forename: Maki
authors.initials: M
authors.lastname: Okube
authors.forename: Akihiko
authors.initials: A
authors.lastname: Nakatsuka
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Sugiyama
keywords: Ti K-edge; Ti compounds; absorption intensity invariant point; pre-edge peak; temperature dependence