Journal of Materials Science

, Volume 27, Issue 23, pp 6440–6446 | Cite as

Valency of copper in 123 oxides

  • N. S. Raman
  • B. Viswanathan
  • T. K. Varadarajan


The valency of copper in freshly prepared as well asin situ high-temperature oxygen-treated 123 oxides was analysed by X-ray photoelectron spectroscopy. The results suggest the presence of Cu2+ and Cu3+ along with Cu+. This observation is supported by cyclic voltammograms of 123 oxides recorded in a formamide medium. The valence band of 1 23 oxides was probed using X-ray (MgKα) and ultraviolet (He-I) sources. It was observed that the Cu-O hybridized orbital in YBa2Cu3O7−x responsible for conduction decreases with time in an ultrahigh vacuum and increases with oxygen treatment temperature.


Oxide Oxygen Polymer Copper Spectroscopy 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • N. S. Raman
    • 1
  • B. Viswanathan
    • 1
  • T. K. Varadarajan
    • 1
  1. 1.Department of ChemistryIndian Institute of TechnologyMadrasIndia

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