States of oxygen ordering in YBa/sub 2/Cu/sub 3/O/sub z/
Conference
·
OSTI ID:5889838
The compound YBa/sub 2/Cu/sub 3/O/sub z/ (1-2-3) was the first one whose superconducting transition temperature exceeded the technologically important temperature of 77K. Actually, the 1-2-3 compound at close to oxygen stoichiometry z = 7 became superconducting at about T/sub c/ = 90K, with T/sub c/ dropping by increments as z decreased from the value 7. In the 90K superconducting phase, occupied sites form O--Cu--O chains, and the resulting three-dimensional structure has orthorhombic symmetry. When available sites in the mirror plane are occupied statistically by O ions, the resulting structure has tetragonal symmetry and the material is nonsuperconducting. It thus appears that the tetragonal to orthorhombic transition in the 1-2-3 compound can be modeled by an order-disorder transition in the mirror plane. It is the object of this paper to review the properties of this transition and to derive appropriate phase diagrams pertaining to oxygen ordering in the plane. Much pertinent information concerning oxygen ordering in 1-2-3 is reviewed in a recent paper by Beyers and Shaw. 37 refs., 8 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5889838
- Report Number(s):
- LBL-27267; CONF-890480-1; ON: DE89014893
- Country of Publication:
- United States
- Language:
- English
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·
OSTI ID:5411647
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OSTI ID:5642264
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
GROUND STATES
MONTE CARLO METHOD
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
STOICHIOMETRY
SUPERCONDUCTIVITY
SYMMETRY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIAGRAMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LEVELS
GROUND STATES
MONTE CARLO METHOD
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHYSICAL PROPERTIES
STOICHIOMETRY
SUPERCONDUCTIVITY
SYMMETRY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS