Process for making high temperature Bi-Sr-Ca-Cu oxide supercondu

Details Process for making high temperature Bi-Sr-Ca-Cu oxide supercondu Process for making high temperature Bi-Sr-Ca-Cu oxide supercondu

1995-06-07

1997-12-30

Lieberman, Paul

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Heating, annealing, or sintering

505440, 505441, 505737, 505742, 505782, 252521, H01B 1200, C04B 35626, C04B 3564

Patent

active

057030219

ABSTRACT:
A description is given of superconducting substances having a content of Bi, Sr, Ca and Cu, and of processes for their preparation from the metal oxides within a range which is specified by the overall composition Bi.sub.a (Sr,Ca).sub.b -Cu.sub.6 O.sub.x, where a=3-24 and b=3.23-24, with an Sr/Ca atomic ratio of 1:9-9:1 and a Bi:(Ca+Sr) atomic ratio of 0.3-1.5. The transition temperature is at least 60 K. The principal phase crystallizes in the orthorhombic system. The pure compounds Bi.sub.4 (Sr,Ca).sub.4 Cu.sub.2 O.apprxeq..sub.12 and Bi.sub.4 (Sr,Ca).sub.6 Cu.sub.4 O.apprxeq..sub.20.

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