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FABRICATION OF BISMUTH-BASED OXIDE SUPERCONDUCTORS BY YAG-LASER IRRADIATION.

[In Japanese. / En japonais.]

Author(s) : YUYAMA M.

Type of article: Article

Summary

BISMUTH-BASED OXIDE SUPERCONDUCTORS WERE FORMED BY A SIMPLE PROCESS WHERE A PASTE LAYER CONTAINING OXIDE POWDERS OF COMPONENT ELEMENTS IS PAINTED ON EITHER COPPER OR MAGNESIUM-OXIDE SUBSTRATE AND IRRADIATED USING A YAG LASER. THISPROCESS REQUIRES NO SUBSTRATE HEATING, POST ANNEALING AND SLOW COOLI THE STARTING COMPOSITION OF MIXED OXIDE POWDERS CORRESPONDS TO THAT OF THE SO-CALLED 2223 PHASE. IRRADIATION IS CARRIED OUT AT A LASER BEAM ENERGY OF 50-70 W AND A SAMPLE MOVING SPEED OF 0.025 MM/S. ALTHOUGH THE MAJOR BISMUTH-OXIDE SUPERCONDUCTOR FORMED IS THE SO-CALLED 2212 PHASE WITHOUT C-AXIS ORIENTED TEXTURE, A SMALL AMOUNT OF THE HIGH-CRITICAL TEMPERATURE 2223 PHASE IS SOMETIMES FOUND IN SAMPLESWITH THE MAGNESIUM-OXIDE SUBSTRATE. THE MAXIMUM CRITICAL TEMPERATURE (ONSET) AND CRITICAL TEMPERATURE (ZERO RESISTIVITY) OBTAINED WERE 70 AND 57 K, RESPECTIVELY. THE MAXIMUM CRITICAL CURRENT OBTAINED WAS 13 A/MM2 AT 4.2 K.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 1992-0950
  • Languages: Japanese
  • Source: Cryogenics/ Cryog. Eng. - vol. 26 - n. 4
  • Publication date: 1991
  • Document available for consultation in the library of the IIR headquarters only.

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