Grain growth and the microstructural effects on the properties of YBa sub 2 Cu sub 3 O sub 7 minus y superconductor

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1990.1819· OSTI ID:6445915

Chu, C T; Dunn, B ^[1]

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1. Department of Materials Science and Engineering, Solid State Science Center, University of California, Los Angeles, CA (USA)

The microstructural development and grain growth of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} ceramics at 925, 950, and 975 {degree}C were studied. Densification occurred quite rapidly at temperatures below 925 {degree}C. The grain growth of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} followed a {ital D}{sup 5}{minus}{ital D}{sub 0}{sup 5}={ital Kt} relation when sintered at 925 and 950 {degree}C. At 975 {degree}C, the kinetics changed to cubic ({ital D}{sup 3}) behavior which can be attributed to the formation of a liquid phase at grain boundaries. A trend of decreasing {ital J}{sub {ital c}} with increasing sintering temperature was observed. Other properties including {ital T}{sub {ital c}} and the width of the transition were virtually unaffected by the change in microstructure. Without prolonged annealing, a relatively homogeneous oxygen stoichiometry of 6.8 was obtained for fairly dense samples ({gt}93% of theoretical). These results suggest that the oxygenation rate of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} was quite rapid between the tetragonal phase and the orthorhombic composition of YBa{sub 2}Cu{sub 3}O{sub 6.8}.

• OSTI ID: 6445915
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 5:9; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CURRENT DENSITY
CURRENTS
DATA
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
GRAIN BOUNDARIES
GRAIN GROWTH
HEAT TREATMENTS
HIGH TEMPERATURE
HIGH-TC SUPERCONDUCTORS
INFORMATION
MICROSTRUCTURE
NUMERICAL DATA
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES