Influence of low-temperature fluorination process on the characteristics of superconductors YBa2Cu3O7−δ and Bi4(Ca, Sr)6Cu4O16+δ - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Solid State Ionics Année : 1989

Influence of low-temperature fluorination process on the characteristics of superconductors YBa2Cu3O7−δ and Bi4(Ca, Sr)6Cu4O16+δ

Résumé

The influence of fluorination on series of superconducting oxides YBa2Cu3O7−δ and Bi4(Ca, Sr)6Cu4O16+δ has been investigated. Fluorine gas treatments carried out at low temperature (20°C⩽TF2⩽100°C) yield the formation of a thin film of (oxy) fluoride (or oxyfluoride) on the surface of the material. This layer has been characterized by X-ray diffraction, electron microprobe analysis and Auger spectroscopy. In the case of YBa2Cu3O7−δ, the experimental conditions to achieve an efficient protection of the ceramics against hydrolysis and gas exchange have been determined. The influence of the fluorination treatments on the superconducting properties has been established from ESR, magnetic and conductivity measurements, in particular the improvement of the shielding effect-Meissner effect cycle.

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Chimie

Dates et versions

hal-02950161 , version 1 (27-09-2020)

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Citer

Alain Tressaud, Bernard Chevalier, Bruno Lépine, Khalil Amine, Jean-Michel Dance, et al.. Influence of low-temperature fluorination process on the characteristics of superconductors YBa2Cu3O7−δ and Bi4(Ca, Sr)6Cu4O16+δ. Solid State Ionics, 1989, 32-33 (Part 2), pp.1109-1114. ⟨10.1016/0167-2738(89)90404-9⟩. ⟨hal-02950161⟩

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