Observation of superconductivity in (Y/sub 1-x/Ca/sub x/)Ba/sub 2/Cu/sub 3/O/sub 6/
Journal Article
·
· J. Solid State Chem.; (United States)
Substitution of Ca/sup 2 +/ for Y/sup 3 +/ in YBa/sub 2/Cu/sub 3/O/sub 6/ converts this tetragonal semiconductor into a tetragonal superconductor with a T/sub c/ of 50 K. Furthermore, the structure of (Y/sub 0.8/Ca/sub 0.2/)Ba/sub 2/Cu/sub 3/O/sub 6/, determined by neutron powder diffraction, is fully consistent with partial oxidation of the Cu(2)-O sheets, whereas the linear O-Cu(1)-O units do not undergo oxidation. Observation of a limited solid solubility for Ca/sup 2 +/ in this structure is attributed to a maximum allowed oxidation state for Cu(2). This implies that in the superconductor YBa/sub 2/Cu/sub 3/O/sub 7/ the Cu-O chains are responsible for the T/sub c/ of 90 K, whereas the Cu-O sheets alone produce superconductivity at 50 K in YBa/sub 2/Cu/sub 3/O/sub 6.5/.
- Research Organization:
- E. I. du Pont de Nemours and Co., Inc., Wilmington, DE (USA)
- OSTI ID:
- 6182483
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 78:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Wed Jun 01 00:00:00 EDT 1988
· J. Superconduct.; (United States)
·
OSTI ID:5929674
Effect of substitution of Bi, Ga, and Fe on the structure and superconducting transition of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub 6. 5+//sub delta/
Journal Article
·
Sun May 01 00:00:00 EDT 1988
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:5255982
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Sun Oct 01 00:00:00 EDT 1995
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OSTI ID:207195
Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
NEUTRON DIFFRACTION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
INFORMATION
NEUTRON DIFFRACTION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWDERS
SCATTERING
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES