X-ray absorption spectroscopic study on Bi2Sr2Ca1-xYxCu2O 8+δ (x = 0-1)

Dong Kuk Kim*, Jin Ho Choy, Minoru Osada, Masato Kakihana, Masahiro Yoshimura

*この研究の対応する著者

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The X-ray absorption near edge spectra for Bi2Sr2Ca1-xYxCu2O 8+δ (x = 0-1) have been investigated at Cu K- and Bi LIII-edges. Upon the substitution of Y for Ca, overall edge of Cu K-edge XANES spectra shifts towards the lower energy side, indicating the decrease of the formal Cu valence state. The more detailed fine structure was studied from the second-derivative Cu K-edge XANES spectra, and it was suggested that the Cu-O bond distance increases with the substitution of Y3+ for Ca2+. There is no noticeable energy shift in Bi LIII-edge XANES spectra. This is not consistent with the previously reported results. But in our case, invariant spectra upon the substitution of Y might be due to the charge transfer along the Cu-O-Bi bond as well as the amount of the incorporated excess oxygen. The Cu K-edge EXAFS spectra for the present compounds showed average Cu-O bond distance to increase upon the substitution of Y, which is consistent with the Cu K-edge XANES results.

本文言語English
ページ(範囲)291-295
ページ数5
ジャーナルSolid State Ionics
108
1-4
出版ステータスPublished - 1998 5月 1
外部発表はい

ASJC Scopus subject areas

  • 電気化学
  • 物理化学および理論化学
  • エネルギー工学および電力技術
  • 材料化学
  • 凝縮系物理学

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