BISMUTH OXIDE SUPERCONDUCTING WIRE ROD AND PROCESS FOR PRODUCING THE SAME

Title:

BISMUTH OXIDE SUPERCONDUCTING WIRE ROD AND PROCESS FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2005/001852

Kind Code:

A1

Abstract:

A process for producing a bismuth oxide superconducting wire rod, comprising the step of subjecting to plastic forming and heat treatment a raw material powder having a superconducting phase composed of Bi, Pb, Sr, Ca, Cu and O wherein the proportion of (Bi+Pb) : Sr : Ca : Cu is about 2 : 2 : 1 : 2 and having a nonsuperconducting phase containing Pb, the proportion of (Bi+Pb) : Sr : Ca : Cu being about 2 : 2 : 2 : 3 in the powder, the ratio of nonsuperconducting phase to superconducting phase being 5 wt.% or less, or a raw material powder having a superconducting phase of orthorhombic crystal wherein the proportion of (Bi+Pb) : Sr : Ca : Cu is about 2 : 2 : 1 : 2, the proportion of (Bi+Pb) : Sr : Ca : Cu being about 2 : 2 : 2 : 3 in the powder, so that not only is the orientation of Bi-2223 crystal improved but also the aggregation of nonsuperconducting phase is inhibited to thereby realize high critical current density.

Inventors:

AYAI NAOKI (JP)

Application Number:

PCT/JP2004/008668

Publication Date:

January 06, 2005

Filing Date:

June 14, 2004

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)
AYAI NAOKI (JP)

International Classes:

H01L39/24; (IPC1-7): H01B13/00; H01B12/10

Foreign References:

JPH04292814A	1992-10-16
JP3149441B2	2001-03-26
JPH0597440A	1993-04-20
JPH0692717A	1994-04-05

Other References: