Electron microscopy study of Pb-substitution in bulk Bi-Sr-Ca-Cu-O superconductors

Journal Article · Sat Jul 01 04:00:00 EDT 1989 · Journal of Materials Research; (USA)

DOI:https://doi.org/10.1557/JMR.1989.0748· OSTI ID:5575368

Werder, D J; Chen, C H; Jin, S; Sherwood, R C ^[1]

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1. AT T Bell Laboratories, Murray Hill, New Jersey 07974 (US)

We present the results of an electron microscopy study of Pb-substitution in bulk Bi-Sr-Ca-Cu-O superconductors. We observe grains with {ital c}-axis lattice parameters of 30.8 A (2212 phase), 36.7 A (2223 phase), and 43.2 A (2234 phase) containing no intergrowth defects. The existence of two separate incommensurate superstructures, {ital Q}{sub 1} and {ital Q}{sub 2}, which were previously observed in Pb-doped ceramics and single crystals, has been confirmed in this study. It is found that superlattice reflections from the {ital Q}{sub 1}-modulated structure in the 2223 phase are much weaker than those from the {ital Q}{sub 2}-modulation, whereas the diffraction intensities of the {ital Q}{sub 1}- and {ital Q}{sub 2}-modulations in the 2212 phase are similar. We also show that the periodicity along the {ital b}-axis of the {ital Q}{sub 2}-modulation increases with increasing Pb-substitution, contrary to the implications of a previously suggested structural model.

• OSTI ID: 5575368
• Journal Information: Journal of Materials Research; (USA), Journal Name: Journal of Materials Research; (USA) Vol. 4:4; ISSN JMREE; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL DOPING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
GRAIN SIZE
IMAGES
LATTICE PARAMETERS
LEAD ADDITIONS
LEAD ALLOYS
MICROSCOPY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
RESOLUTION
SCATTERING
SIZE
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SUPERSYMMETRY
SYMMETRY
TRANSITION ELEMENT COMPOUNDS