Mechanisms of interaction between the reactive species of a (CF4+O2) plasma and YBa2Cu3O7−δ ceramics have been proposed through detailed angle-resolved X-ray photoelectron spectroscopic analyses. At the surface of the outer grains, the plasma treatment removes (OH)− and (CO3)2− species contained in the degradation layer and gives rise to a fluoride-rich layer, whereas in the bulk of the material the occurrence of metal-fluorine bonds in the superconducting phase has been assumed. An increase of the oxidation state of copper has been also detected, confirming the oxidizing effect of the plasma treatment. A comparison with the oxidation mechanisms obtained by fluorine gas treatment is proposed.
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Magro, C., Tressaud, A., Hudáková, N. et al. Plasma-enhanced fluorination of YBa2Cu3O7−δ ceramics. JOURNAL OF MATERIALS SCIENCE 29, 4260–4267 (1994). https://doi.org/10.1007/BF00414208
- Spectroscopic Analysis