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Plasma-enhanced fluorination of YBa2Cu3O7−δ ceramics

Part I Improvement of the superconducting properties

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Abstract

The radiofrequency plasma technique involving mixtures of CF4+O2 gases has been applied to the surface treatment of high Tc superconducting oxides (YBa2Cu3O7−δ). Investigation of the various experimental parameters of the process has shown that the improvement of the critical current density, J c, mainly depends on the inlet precursor composition CF4+τ%O2, on the total pressure and on the reaction time. The presence of fluorine in the bulk of the ceramics has been observed from electron microprobe analysis, together with an increase of the “Cu3+” content. The plasma-enhanced fluorination (PEF) treatment improves the superconducting properties of the materials: both values of the resistivity in the normal state and of the superconducting transition width are reduced and the critical transition temperature is improved by about 1 K.

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Author notes

  1. N. Hudáková

    Present address: Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04353, Košice, Slovakia

Authors and Affiliations

  1. Laboratoire de Chimie du Solide du CNRS, 351 cours de la Libération, Université de Bordeaux I, 33405, Talence Cedex, France

    C. Magro, A. Tressaud, L. Lozano & N. Hudáková

  2. Institut des Matériaux de Nantes, 2 rue de la Houssiniére, 44072, Nantes Cedex 03, France

    C. Cardinaud & G. Turban

Authors
  1. C. Magro
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  2. A. Tressaud
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  3. L. Lozano
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  4. N. Hudáková
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  5. C. Cardinaud
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  6. G. Turban
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Magro, C., Tressaud, A., Lozano, L. et al. Plasma-enhanced fluorination of YBa2Cu3O7−δ ceramics. JOURNAL OF MATERIALS SCIENCE 29, 4225–4231 (1994). https://doi.org/10.1007/BF00414202

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  • DOI: https://doi.org/10.1007/BF00414202

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