Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-06-29
1992-01-14
Lusignan, Michael
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
505742, 505780, 252521, 423593, H01L 3912
Patent
active
050811037
ABSTRACT:
A method of incorporating fluorine into the YBa.sub.2 Cu.sub.3 O.sub.7-x system by annealing YBa.sub.2 Cu.sub.3 O.sub.7-x powder in a fluorine-containing gas, especially NF.sub.2 gas. The YBa.sub.2 Cu.sub.3 O.sub.7-x material is annealed in the fluorine-containing gas (either pure NF.sub.3 or NF.sub.3 /O.sub.2 blend of F.sub.2 /N.sub.2 blend) at a temperature which allows sufficient reactivity with the fluorine gas while maintaining the system well below temperatures at which oxygen incorporation is observed to take place in the normal YBa.sub.2 Cu.sub.3 O.sub.7-x system.
REFERENCES:
patent: 4916116 (1990-04-01), Yamazaki
LaGraff et al, "Magnetic and Structural Properties of YBa.sub.2 Cu.sub.3 O.sub.7-x F.sub.y as prepared by a NF.sub.3 gas anneal", Phys. Rev. B. vol. 39 No. 1, Jan. 1989 pp. 347-355.
Gressler Carole A.
Taschler David R.
Taylor Jenifer A. T.
Air Products and Chemicals Inc.
King Roy V.
Lusignan Michael
Marsch William F.
Simmons James C.
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