Core-level spectroscopic studies suggest that cuprates nominally supposed to contain Cu3+ ions are likely to have the excess positive charge on oxygen instead, giving rise to O– type species (oxygen holes).
G. R. Rao, M. K. Rajumon, D. D. Sarma and C. N. R. Rao, J. Chem. Soc., Chem. Commun., 1989, 1536 DOI: 10.1039/C39890001536
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