Journal of Synchrotron Radiation

Volume 20, Part 4 (July 2013)

short communications

J. Synchrotron Rad. (2013). 20, 641-643    [ doi:10.1107/S0909049513009175 ]

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

T. Hiratoko, A. Yoshiasa, T. Nakatani, M. Okube, A. Nakatsuka and K. Sugiyama

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.

Keywords: pre-edge peak; Ti K-edge; temperature dependence; Ti compounds; absorption intensity invariant point.

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