Superconductor technology: apparatus – material – process – High temperature – per se – Having tc greater than or equal to 150 k
Patent
1989-10-19
1991-05-14
Roy, Upendra
Superconductor technology: apparatus, material, process
High temperature , per se
Having tc greater than or equal to 150 k
156610, 427 531, 427 62, 437910, 428930, 505729, H01L 3924, H01L 3900
Patent
active
050156187
ABSTRACT:
A method for preparing a highly aligned thick film of superconducting bismuth strontium calcium copper oxide ceramic material to improve its critical current density. A film about 5-200 .mu.m thick of bismuth strontium calcium copper oxide is deposited on a suitable substrate. The ratios of Bi:(Sr, Ca):Cu in the film are about 2:3:2 to 2:4:3. A laser beam is translated over the deposited film at a rate of about 0.2-15 cm/hr while the film is held at a temperature of about 500.degree.-950.degree. C. The beam is about 0.01-0.50 cm wide along the direction of translation, and provides about 0.2-10W of optical power to the film. The temperature and the beam translation rate, width, and optical power are selected to permit zone melting and resolidification of the film to form the highly aligned thick film of superconducting bismuth strontium calcium copper oxide ceramic material. The J.sub.c may, if desired, be further improved by annealing the resolidified film at about 900.degree.-965.degree. C. for about 1-300 hr.
REFERENCES:
patent: 4931424 (1990-06-01), Henty
patent: 4940842 (1990-07-01), Schultz et al.
patent: 4962085 (1990-10-01), de Barbadillo, II et al.
Levinson et al., Appl. Phys. Letts., 55 (16 Oct. 1989) 1683.
Liu et al., Supercond. Sci. Technol. 1 (1989) 254.
Feigelson et al., Science, 240 (17 Jun. 1988) 1642.
Gazit et al., Jour. Crystal Growth, 91 (1988) 318.
Takekawa et al., Jour. Crystal Growth, 92 (Oct. 1988) 687.
Moon et al., Appl. Phys. Letts. 55 (2 Oct. 1989) 1466.
Craig Frances P.
GTE Laboratories Incorporated
Roy Upendra
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