Process for controlling crystalline orientation of oxide superco

Details Process for controlling crystalline orientation of oxide superco Process for controlling crystalline orientation of oxide superco

1995-11-02

1998-02-10

King, Roy V.

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

Heating, annealing, or sintering

505501, 505473, 505474, 505475, 505480, 505729, 505742, 427 62, B05D 302

Patent

active

057169080

ABSTRACT:
A process for controlling crystalline orientation of an oxide superconductive film includes a first-heat-treatment step, and a second-heat-treatment step. In the first-heat-treatment step, an oxide superconductive film is heated and held in non-oxidizing atmosphere. Accordingly, partial oxygen deficiency is caused in the oxide superconductive film. In the second-heat-treatment step, the oxide superconductive film is heated and held in oxygen-rich atmosphere. Consequently, oxygen is re-introduced into the oxide superconductive film. Thus, crystalline orientation of the oxide superconductive film is altered. The process enables to readily form not only an "a"-axis-oriented oxide superconductive film but also a "b"-axis-oriented oxide superconductive film.

REFERENCES:
"Oxygen ordering and transformation from a-axis oriented to b-axis oriented films in YBa.sub.2 Cu.sub.3 O.sub.y by K. Kawamoto and I. Hirabayashi, (an offprint from Advances In Superconductivity VII", by K. Yamafuji and T. Morishita), Proceedings of the 7th International Symposium on Superconductivity (ISS '94), Nov. 8-11, 1994, Kitakyushu, pp. 999-1002.

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