Abstract
The X-ray photoelectron (XPS) core-level spectra of Cu-metal, Cu2O, CuO, NaCuO2 and YBa2Cu3O7−x have been determined. It has been shown, that the Cu3+ ions in NaCuO2 are reduced to lower valence states by X-rays in ultrahigh vacuum (UHV). The determination of the electron binding energy of the Cu 2 p 3/2 level in NaCuO2 yields a value of 934.1 eV. The shape of the Cu 2 p 3/2 peak as well as the appearence of a shake-up satellite in YBa2Cu3O7−x which is smaller than in CuO show that YBa2Cu3O7−x contains Cu3+ ions. The behaviour of YBa2Cu3O7−x also was studied during X-ray irradiation and a reduction was noticeable.
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Herzog, W., Schwarz, M., Sixl, H. et al. X-ray photoelectron spectroscopy of the high-temperature superconductor YBa2Cu3O7−x and the copper oxides. Z. Physik B - Condensed Matter 71, 19–22 (1988). https://doi.org/10.1007/BF01310839
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DOI: https://doi.org/10.1007/BF01310839