Grain boundary effects in processing high T/sub c/ superconductors. [YBa/sub 2/Cu/sub 3/O/sub 7/]

Conference · Wed Dec 31 23:00:00 EST 1986

OSTI ID:6296288

Ginley, D S; Venturini, E L; Kwak, J F; Baughman, R J; Morosin, B

The advent of superconductors with transitions above 77K has tremendous practical implications. We demonstrate that even in single phase YBa/sub 2/Cu/sub 3/O/sub 7/, intergrain effects at high temperature (700 to 1100/sup 0/C) dominate the synthesis of the material. In fact, superconductivity occurs in thin shells (<0.4 microns) surrounding non-superconducting grains in all of the recent high T/sub c/ materials independent of stoichiometry and synthesis method. We believe the nature of the superconducting shells to be unique and present data demonstrating their existence and the mechanism of their formation.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6296288
• Report Number(s): SAND-87-1156C; CONF-871027-12; ON: DE87009297
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GRAIN BOUNDARIES
LOW TEMPERATURE
MAGNETIC FLUX
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SHELLS
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES