Large single domain 123 material produced by seeding with single

Details Large single domain 123 material produced by seeding with single Large single domain 123 material produced by seeding with single

1997-04-01

1998-07-07

Lieberman, Paul

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With melting

505451, 505729, 252521, 23301, 423 211, 423263, H01L 3912, C04B 35653

Patent

active

057768641

ABSTRACT:
A method of fabricating bulk YBa.sub.2 Cu.sub.3 O.sub.x where compressed powder oxides and/or carbonates of Y and Ba and Cu present in mole ratios to form YBa.sub.2 Cu.sub.3 O.sub.x are heated in the presence of a Nd.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.y seed crystal to a temperature sufficient to form a liquid phase in the YBa.sub.2 Cu.sub.3 O.sub.x while maintaining the seed crystal solid. The materials are slowly cooled to provide a YBa.sub.2 Cu.sub.3 O.sub.x material having a predetermined number of domains between 1 and 5. Crack-free single domain materials can be formed using either plate shaped seed crystals or cube shaped seed crystals with a pedestal of preferential orientation material.

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Critical Current Densities in Superconducting Y-B-Cu-O Prepared by the Quench-and-Melt Growth Technique, Japanese Journal of Applied Physics, vol. 28, No. 9, Sep. 1989,L.1545.
Superconductivity of YBa.sub.2 Cu.sub.3 O.sub.7x by Addition of Reactive Fine Powders, Vo.30 No. 2. Feb. 1991, pp. 245-250, Sakai et al. J.J.A.P.
Todt et al "Processing of Large YBa.sub.2 Cu.sub.3 O.sub.x Domains for Levitation Applications . . . " Journal of Electronic Materials, vol. 23, No. 11, Nov. 1994, pp. 1127-1130.

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