Crystal structure of DyBa/sub 2/Cu/sub 4/O/sub 8/: A new 77 K bulk superconductor
Single-crystal x-ray diffraction data from DyBa/sub 2/Cu/sub 4/O/sub 8/ are used to confirm the structure of RBa/sub 2/Cu/sub 4/O/sub 8/ (R = Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, and Tm), all of which have been synthesized in bulk and display substantial Meissner diamagnetism. The structure is orthorhombic, space group Ammm, with a = 3.846 3(3), b = 3.872 6(3), and c = 27.237(2) A. Copper-oxygen layers parallel to (001) are dimpled as in the 1-2-3 structure. Unique copper-oxygen strips parallel to (100) have copper in distorted square-planar coordination. Magnitudes of oxygen anisotropic thermal vibrations are significantly less than in the 1-2-3 structure; thus the oxygen content of 1-2-4 is expected to be significantly more stable.
- Research Organization:
- Geophysical Laboratory, Carnegie Institution of Washington, 2801 Upton Street NW, Washington, DC 20008-3898
- OSTI ID:
- 6419786
- Journal Information:
- Appl. Phys. Lett.; (United States), Vol. 54:11
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ORTHORHOMBIC LATTICES
COPPER OXIDES
DYSPROSIUM OXIDES
ERBIUM OXIDES
EUROPIUM OXIDES
GADOLINIUM OXIDES
HOLMIUM OXIDES
NEODYMIUM OXIDES
SAMARIUM OXIDES
THULIUM OXIDES
YTTRIUM OXIDES
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
LAYERS
LOW TEMPERATURE
STOICHIOMETRY
SUPERCONDUCTIVITY
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL LATTICES
DATA
DIFFRACTION
DYSPROSIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ERBIUM COMPOUNDS
EUROPIUM COMPOUNDS
GADOLINIUM COMPOUNDS
HOLMIUM COMPOUNDS
INFORMATION
NEODYMIUM COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SCATTERING
THULIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
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Cermets
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360204 - Ceramics
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