Flux pinning by precipitates in the Bi-Sr-Ca-Cu-O system

Details Flux pinning by precipitates in the Bi-Sr-Ca-Cu-O system Flux pinning by precipitates in the Bi-Sr-Ca-Cu-O system

1990-02-28

1992-05-19

Dixon, Jr., William R.

Superconductor technology: apparatus, material, process

High temperature , per se

Having tc greater than or equal to 150 k

505782, 505733, 501126, 252518, 252521, H01B 1200, H01L 3912

Patent

active

051149095

ABSTRACT:
A fundamental pinning mechanism has been identified in the Bi-Sr-Ca-Cu-O system. The pinning strength has been greatly increased by the introduction of calcium- and copper-rich precipitates into the sample matrix. The calcium and copper are supersaturated in the system by complete melting, and the fine calcium and copper particles precipitated during subsequent crystallization anneal to obtain the superconducting phases. The intragrain critical current density has been increased from the order of 10.sup.5 A/cm.sup.2 to 10.sup.7 A/cm.sup.2 at 5 T.

REFERENCES:
Shi et al., "Flux Pinning by Precipitates in the Bi-Sr-Ca-Cu-O System", P Rev. B, vol. 40, #7, Sep. 1, 1989, pp. 5255-5258.
Shi et al., "110K Superconductivity in Crystallized Bi-Sr-Ca-Cu-O Glasses", Physics C, 156, Nov. or Dec. 1988, pp. 822-826.
Shi et al., "Formation of the 110-K Superconducting Phase via the Amorphous State in the Bi-Ca-Sr-Cu-O System", Phy. Rev. B., vol. 3, #13, May 1, 1989, pp. 9091-9098.

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