Atomic structure of grain boundaries and surfaces in YBa sub 2 Cu sub 3 O sub 7 minus. delta. and LaBaCaCu sub 3 O sub 7 minus. delta
- State Univ., Leiden (Netherlands) Lawrence Berkeley Lab., CA (USA)
- Lawrence Berkeley Lab., CA (USA)
- Universiteit Antwerpen (Belgium)
High-resolution electron microscopy (HREM) studies of grain boundaries and fractured surfaces in both the tetragonal and orthorhombic phases of dense (> 90%) YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} and tetragonal LaBaCaCu{sub 3}O{sub 7{minus}{delta}} have been conducted. Grain boundaries in polycrystalline YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} are found to be frequently parallel to a (001) plane of one of the adjacent grains, with a structure similar to that of the (001) surface of fractured YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Matching of experimental and calculated images shows that the outermost surface layer in this compound is a deformed BaO layer. Both grain boundaries and fractured surfaces in LaBaCaCu{sub 3}O{sub 7{minus}{delta}} show no such tendency for preferential orientation of the interface plane. Results indicate that the low critical currents observed in sintered materials are caused by textured grain growth in combination with the atomic structure of the grain boundary plane, and the intercalation of off-stoichiometric species near the grain boundary.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6259289
- Journal Information:
- Journal of Superconductivity; (USA), Journal Name: Journal of Superconductivity; (USA) Vol. 2:3; ISSN JOUSE; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CRYSTAL DEFECTS
CRYSTAL FACES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CURRENTS
DEFORMATION
ELECTRIC CURRENTS
ELECTRON MICROSCOPY
ELECTRONIC STRUCTURE
FABRICATION
FAILURES
FRACTURE PROPERTIES
FRACTURES
GRAIN BOUNDARIES
HEAT TREATMENTS
MAGNETIC FLUX
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
RESOLUTION
SINTERED MATERIALS
SINTERING
STRUCTURAL CHEMICAL ANALYSIS
SUPERCONDUCTORS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES