(Bi,Pb)SrCaCuO precursor material for the oxide powder in tube method (OPIT)
AssigneeHoechst Aktiengesellschaft
InventorsMarc Neubacher, Joachim Bock, Christoph Lang, Eberhard Preisler, Helga Weis
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Abstract
Process for preparing a high-T.sub.c superconductor as a precursor material for the oxide-powder-in-tube method (OPIT). The present invention relates to a process for preparing a high-T.sub.c superconductor as a precursor material for the oxide-powder-in-tube method, which involves mixing the oxides of the elements Bi, Sr, Ca and Cu and completely melting them at temperatures of >1000.degree. C., then casting the melt onto a substrate which is kept at room temperature, and disintegrating the cooled melt block and grinding it into a powder.
Claims6
A precursor for a Bi-2223 high-temperature superconductor prepared according to a process wherein a mechanical mixture of metal oxides containing bismuth, lead, strontium, calcium and copper in a stoichiometric ratio corresponding to a superconductor is completely melted in air at temperatures above 1000.degree. C., wherein the melt is then poured out onto a base which is kept at room temperature and wherein the cooled melt body is subsequently disintegrated and then ground into powder, wherein the precursor has a composition corresponding to the formula selected from the group consisting of Bi.sub.2.2-y Pb.sub.y (Sr,Ca).sub.4.2 Cu.sub.3 O.sub.x wherein y<0.4, Bi.sub.2.13-y Pb.sub.y (Sr,Ca).sub.3.86 Cu.sub.3 O.sub.x wherein y<0.33, Bi.sub.2.1-y Pb.sub.y (Sr,Ca).sub.3.9 Cu.sub.3.1 O.sub.x wherein y<0.4 and Bi.sub.2.1-y Pb.sub.y (Sr,Ca).sub.2.9 Cu.sub.2.1 O.sub.x wherein y<0.4.
Dependencies are inferred from the claim text.