Method of producing superconducting PrBa.sub.2 Cu.sub.3 O.sub.y

Details Method of producing superconducting PrBa.sub.2 Cu.sub.3 O.sub.y Method of producing superconducting PrBa.sub.2 Cu.sub.3 O.sub.y

1997-03-26

1999-04-06

Kunemund, Robert

Superconductor technology: apparatus, material, process

Processes of producing or treating high temperature...

With melting

505100, 505126, 505190, 505702, 505729, 117 49, 117 37, 117931, 117947, C30B 1302

Patent

active

058918280

ABSTRACT:
PrBa.sub.2 Cu.sub.3 O.sub.Y exhibiting superconductivity is provided by a method including the steps of preparing a solvent consisting of a mixture of praseodymium oxide, at least one of barium oxide and barium carbonate, and copper oxide at a mixing ratio of between 1:3:5 and 1:8:20, disposing the solvent between a feed rod of PrBa.sub.2 Cu.sub.3 O.sub.7 formed to a high density and a seed crystal, heating the solvent to a temperature of 880.degree.-980.degree. C. in an atmosphere of an inert gas of at least one of argon and nitrogen mixed with 0.01-2% oxygen to form a floating solvent zone, moving the floating solvent zone toward the feed rod at 0.1-1.0 mm/hr under a temperature gradient at the solid-liquid interface of 25.degree.-35.degree. C./mm to precipitate single crystal on the seed crystal, and heat-treating the single crystal obtained in an atmosphere containing not less than 15% oxygen. Another aspect of the invention provides a superconducting device including the superconducting PrBa.sub.2 Cu.sub.3 O.sub.Y single crystal material in combination with at least one non-superconducting PrBa.sub.2 Cu.sub.3 O.sub.Y crystal material.

REFERENCES:
patent: 5409892 (1995-04-01), Hayashi
patent: 5444040 (1995-08-01), Kojima
patent: 5602081 (1997-02-01), Nakamura
patent: 5611854 (1997-03-01), Veal
patent: 5627142 (1997-05-01), Yamada
patent: 5648319 (1997-07-01), Morita

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