Crystalline linkage and defect structures in bulk zone melt textured YBa[sub 2]Cu[sub 3]O[sub 7] observed by transmission electron microscopy

Journal Article · Mon May 24 00:00:00 EDT 1993 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.109244· OSTI ID:6516062

Zanota, A; Kvam, E P ^[1]; Balkin, D; McGinn, P J ^[2]

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1. School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-1289 (United States)
2. Department of Electrical Engineering, Notre Dame University, Notre Dame, Indiana 46556 (United States)

The microstructural features of zone melt textured wires of YBa[sub 2]Cu[sub 3]O[sub 7] (123) with and without additions of Y[sub 2]BaCuO[sub 5] have been examined by transmission electron microscopy. The 123 phase is observed to form well aligned platelets, which are of limited extent along [001], but extremely long in the perpendicular directions. Although platelet boundaries are wetted by a second phase, junctions are commonly observed to interconnect the plates. This suggests the possibility that the wires are actually highly defective single crystals. High densities of stacking faults are also observed, particularly at Y[sub 2]BaCuO[sub 5]/YBa[sub 2]Cu[sub 3]O[sub 7] interfaces and at dislocation arrays. It is suggested that these result from a drive for phase conversion to YBa[sub 2]Cu[sub 4]O[sub 8], and that they may be associated with flux pinning.

• DOE Contract Number: FG02-90ER45427
• OSTI ID: 6516062
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 62:21; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
EXTRUSION
FABRICATION
HIGH-TC SUPERCONDUCTORS
INTERFACES
JUNCTIONS
LINE DEFECTS
MATERIALS WORKING
MELTING
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
STACKING FAULTS
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY
WIRES
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZONE MELTING