Patent Number: 6,429,174

Title: Large strongly linked superconducting monoliths and process for making the same

Abstract: A process which relies on a joining technique between two individual strongly linked superconductors is disclosed. Specifically, this invention relates to fabrication of single domains of YBa.sub.2 Cu.sub.3 O.sub.x or YBa.sub.2 Cu.sub.3 O.sub.x with the addition of Y.sub.2 BaCuO.sub.5 and/or other secondary phases such as Pt/PtO.sub.2, CeO.sub.2, SnO.sub.2, Ag, Y.sub.2 O.sub.3 and other rare earth oxides, by using a top-seeded, melt processing technique. Beginning with a single crystal seed such as Nd.sub.1+x Ba.sub.2-x Cu.sub.3 O.sub.x or SmBa.sub.2 Cu.sub.3 O.sub.x crystals, a melt-textured YBCO domain with crystallographic orientation nearly similar to that of the seed crystal can be fabricated. The samples are next machined to desired geometrical shapes. A bonding material is then applied to the ac plane. Low solidification or recrystalization point, similar crystal structure to that of YBa.sub.2 Cu.sub.3 O.sub.x, and capability of growing epitaxially on YBCO domains are critical parameters of the bonding material. The pre-bonded samples are then heat treated such that the bonding material grows epitaxially on the ac plane of YBCO domains resulting in a strongly linked joint. A small amount of pressure may be used to keep neighboring domains together.

Inventors: Sengupta; Suvankar (Upper Arlington, OH)

Assignee: Superconductive Components, Inc.

International Classification: C30B 33/00 (20060101); C30B 33/06 (20060101); H01L 39/02 (20060101); H01L 39/24 (20060101); H01L 039/00 ()

Expiration Date: 08/06/2010