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'oxide/oxide' superconductor materials: electrical properties of Bi-2212/insulator composites.

Tortet L., Monnereau O., Alfred-Duplan C., Vacquier G.

Inżynieria Materiałowa

1998

R. XIX, nr 4

872-875

To reinforce the electrical or mechanical properties of bismuth cuprate superconductor, composites have been elaborated by pressing polycrystalline Bi2Sr2CaCu2O8-6 (2212) mixed with two insulator oxides into pellets, which ares intered near 800 centigrade C. A large domain of composition is investigated. The Bi2CuO4 (2001) oxide reacts with the Bi-2212, decreases its Tc value but can increase its mechanical resistance. In the case of Bi2Sr3CaO7-6/2212 composites, a zero resisntance at low temperature (>> 40 K) is observed up to 80% (vol.) of insulting (2310) oxide. The percolation theory of the Effektive Medium Approximation are used to describe these experimantal results.