XAFS studies of the oxidation process in RbxCsyC60 (x=3, y=0 and x=2, y=1)

Yoshihiro Kubozono, Tamotsu Fujimoto, Hironobu Maeda, Akiko Hirano, Setsuo Kashino, Kokichi Oshima, Hitoshi Yamazaki, Hiroyuki Ishida, Tadao Ishii, Shuichi Emura, Kiyonori Kato

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Abstract

EXAFS measurements of the alkali-doped fullerence superconductors, RbxCsyC60 (x=3, y=0 and x=2, y=1 with Tc=30 and 31 K, respectively), have been made at the Rb K-edge as a function of exposure time to O2 gas. The distances rRb-C=3.35±0.02 and 3.31±0.02 Å were obtained for pristine RbxCsyC60 of x=3, y=0 and x=2, y=1, respectively, in good agreement with the reported value of 3.33 Å at the tetrahedral site determined by X-ray diffraction study. The analysis of the Rb-O EXAFS in Rb3C60 exposed to O2 for 40 h gives rRb-O=2.89±0.05 Å and N=4±1, consistent with the crystallographic values of rubidium oxide (Rb2O: rRb-O=2.91 Å and N=4 at room temperature). The result indicates that the Rb in RbxCsyC60 is converted into Rb2O through the oxidation.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume217
Issue number1-2
DOIs
Publication statusPublished - Nov 10 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Kubozono, Y., Fujimoto, T., Maeda, H., Hirano, A., Kashino, S., Oshima, K., Yamazaki, H., Ishida, H., Ishii, T., Emura, S., & Kato, K. (1993). XAFS studies of the oxidation process in RbxCsyC60 (x=3, y=0 and x=2, y=1). Physica C: Superconductivity and its applications, 217(1-2), 21-26. https://doi.org/10.1016/0921-4534(93)90790-W