Temperature dependence of Zr and Ti K-edge XANES spectra for para- and ferro-electric perovskite-type PbZrO3, PbTiO3 and BaTiO3

16th International Conference on X-ray Absorption Fine Structure

Yoshiasa, A.^1 ; Nakatani, T.^1 ; Hiratoko, T.^1 ; Tobase, T.^1 ; Nakatsuka, A.^2 ; Okube, M.^3 ; Arima, H.^4 ; Sugiyama, K.^4

Graduated School of Sci. and Tech., Kumamoto Univ., Kumamoto

860-8555, Japan^1

Graduate School of Science and Engineering, Yamaguchi Univ., Ube

755-8611, Japan^2

IMR, Tokyo Institute of Technology, Yokohama

226-8503, Japan^3

Department of Institute for Material Research, Tohoku Univ., Sendai

980-8577, Japan^4

关键词: Absorption intensity;    Ferroelectric perovskites;    Quantitative comparison;    Temperature behavior;    Temperature dependence;    Temperature differences;    Temperature range;    Wide temperature ranges;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012121/pdf
DOI  :  10.1088/1742-6596/712/1/012121

来源: IOP

【 摘 要 】

Zr and Ti K-edge XANES spectra of PbZrO3, PbTiO3and BaTiO3perovskite-type compounds were measured in the temperature range from 10K to 850K. Quantitative comparisons for the near-edge spectra were performed in a wide temperature range using the absorption intensity invariant point (AIIP) standardization. Clear temperature dependence for pre-edge shoulder is identified by the calculating the temperature difference of the XANES spectrum intensity. Decrease of pre-edge shoulder and peak intensity is observed only in the para- and ferro-electric phases and draw curves, not straight lines. The gradients for shoulder and pre-edge peak intensity are rich in a variety. The decrease in absorption of pre-edge peak and shoulder is speculated due to the shift from the off-centre position of the Zr atom with respect to the oxygen octahedron to center position. The Zr ion in the PbZrO3para-electric phase has same temperature behaviors of Ti ions in the ferroelectric perovskite.