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O-K α  X-ray emission spectra of La 2 CuO 4  and YBa 2 Cu 3 O 6.9  are compared with calculated spectra. It is shown from O-K α  emission spectra of YBa 2 Cu 3 O x  with varying oxygen content (6.0 &lt; X &lt; 6.9) that with heating the superconducting compound (x = 6.9) oxygen atoms are removed from the Cu-O chains. A method for comparing X-ray self-absorption spectra from compounds with different concentrations of the element under consideration is presented. Cu-L selfabsorption spectra of YBa 2 Cu 3 O x  (6.0 &lt; x &lt; 6.9) are compared with those of Cu, Cu 2 O, CuO, and NaCuOn. By this comparison and from O-K., emission spectra, oxygen 2p holes are found to be present in the superconducting compound. The ionic character of the Cu-O bonds in the nonsuperconducting green phase Y 2 BaCuO 5  is shown with O-K α  emission and Cu-L 3  self-absorption spectroscopy. The energy gap of Y 2 BaCuO 5  is found to be about 5 e V.

X -Ray Emission and X -Ray Self-Absorption in the High - T c Superconductor YBa 2 Cu 3 O 6.9 and other Copper Oxides