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

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)291-295
頁數5
期刊Solid State Ionics
108
發行號1-4
DOIs
出版狀態Published - 1998 5月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 材料科學(全部)
  • 凝聚態物理學

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