123, 247, and 124 cuprate superconductors: Investigations of thermodynamic stabilities, defect structures, and intergrowths
Journal Article
·
· Journal of Solid State Chemistry; (USA)
- Indian Institute of Science, Bangalore (India)
Careful investigations employing nonresonant microwave or rf absorption, Cu{sup 2+} EPR spectra, x-ray diffraction, and electron microscopy show that orthorhombic YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is thermodynamically stable and monophasic when {delta} is 0.0-0.2 (T{sub c} = 90 K), 0.25 (T{sub c} = 80 K), and 0.5 (T{sub c} = 45 K). The last two compositions are associated with ordered oxygen-vacancy structures; in the {delta} = 0.0-0.2 regime, 3b = c. Compositions in the range {delta} = 0.3-0.4 (T{sub c} = 60 K) do not appear to be thermodynamically stable and decompose on annealing, suggesting thereby that the so-called 60 K superconducting phase in the YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} system may not be genuine. 123 cuprates prepared with excess CuO often show fringes of 124 in lattice images. Both 124 and 247 cuprates prepared by the ceramic method in a flowing oxygen atmosphere frequently show intergrowths of each other or with 123. Such epitaxial relationships between 123, 124, and 247 cuprates could be of significance with respect to their superconducting properties.
- OSTI ID:
- 6181502
- Journal Information:
- Journal of Solid State Chemistry; (USA), Journal Name: Journal of Solid State Chemistry; (USA) Vol. 88:1; ISSN JSSCB; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Journal Article
·
Mon Oct 01 00:00:00 EDT 1990
· Physical Review, B: Condensed Matter; (USA)
·
OSTI ID:6014459
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Tue Nov 30 23:00:00 EST 1993
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·
OSTI ID:5774561
Direct conversion of superconducting Y sub 2 Ba sub 4 Cu sub 7 O sub 15 minus. delta. from YBa sub 2 Cu sub 3 O sub 7 minus x at atmospheric pressure in an O sub 2 ambient
Journal Article
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Sun Nov 11 23:00:00 EST 1990
· Applied Physics Letters; (USA)
·
OSTI ID:6290639
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 METALS
BARIUM
COHERENT SCATTERING
COPPER COMPOUNDS
CUPRATES
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
METALS
MICROSCOPY
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRUCTURAL CHEMICAL ANALYSIS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YTTRIUM
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 METALS
BARIUM
COHERENT SCATTERING
COPPER COMPOUNDS
CUPRATES
DATA
DIFFRACTION
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HIGH-TC SUPERCONDUCTORS
INFORMATION
METALS
MICROSCOPY
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRUCTURAL CHEMICAL ANALYSIS
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
YTTRIUM