Plasma-enhanced fluorination of YBa2Cu3O7−δ ceramics
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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.
KeywordsOxidation Polymer Copper Spectroscopic Analysis Fluorine
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- 1.C. MAGRO, A. TRESSAUD, N. HUDAKOVA, L. LOZANO, C. CARDINAUD and G. TURBAN, J. Mater. Sci. 29 (1994) in press.Google Scholar