Rhone-poulenc Chimie

Centre National De La Recherche Scientifique

Compagnie Generale D'electricite

Andre Sulpice

Jacques Chaussy

Robert Tournier

Alain Tressaud

Jean-Michel Dance

Bernard Chevallier

Pascal Lejay

Lucien Lozano

Jean Etourneau

Bernard Raveau

Jackie Provost

Bernard Chevalier

Claude Michel

Francis Deslandes

Jean-Louis Genicon

Jean Mazuer

Jean Pilon

Jean-Louis Tholence

Ceramic superconductor materials, e.g., of rare earth/alkaline earth metal/transition metal/oxygen type, contain an effective stabilizing amount of fluorine atoms distributed therein in a concentration gradient decreasing from the external face surface of the material to the core region thereof; advantageously the fluorine atoms are principally distributed in an external protective diffusion barrier layer.

Process of making fluorine-stabilized superconductor materials

Fluorine-stabilized superconductor materials

A superconducting mixed valence copper oxide, having a formula of the type:

Superconductive mixed valence copper oxide, and method of making it

In a process for making a connection between superconductive wires constituted by one or more strands or filaments of superconductive material embedded in a metallic matrix, the metal constituting the matrix is previously eliminated over a certain length of wire, corresponding to the desired zone of contact between the wires, so as to expose the or each strand of these wires. Thereafter the linkage is established between the strands by exerting thereon a strong pressure, cold. The visible superconductive strands of the two wires are applied, near one another, on a support. A strip of superconductive material is then applied on the visible strands and a sheath made of a material which is a good conductor of electricity is placed around the assembly constituted by the support, the strands of the superconductive wires and the superconductive strip. This assembly is then subjected to a magnetoforming operation provoking crimping of the outer sheath on the support, with crushing of the superconductive strip on the superconductive strands, thus ensuring the electrical connection of the wires with a very low resistance.

Process for making a connection between superconductive wires and to a

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Grenoble, France

Andre Sulpice