A study of high- Tc superconductivity in the Nd-Ba-Cu-O system
Thesis/Dissertation
·
OSTI ID:5633498
The purpose of this study was to investigate superconductivity in the Nd-Ba-Cu-O system, and to define any dissimilarity between NdBa{sub 2}Cu{sub 3}O{sub x} and YBa{sub 2}Cu{sub 3}O{sub x} compounds. NdBa{sub 2}Cu{sub 3}O{sub x} samples were synthesized by a solid-state reaction, which yielded predominantly the 123 phase and showed satisfactory superconducting properties. The phase equilibrium study revealed that there were two ternary compounds (NdBa{sub 2}Cu{sub 3}O{sub x} and Nd{sub 2}BaCuO{sub 5}) and three binary compounds (Nd{sub 2}BaO{sub 4}, Nd{sub 2}CuO{sub 4}, and BaCuO{sub 2}) present in this system. The equilibrium oxygen contents in NdBa{sub 2}Cu{sub 3}O{sub x} were found to be dependent on the annealing temperature and oxygen partial pressure. Compared with YBa{sub 2}Cu{sub 3}O{sub x}, it had slightly higher oxygen contents, possibly due to the larger unit cell. The enthalpy value associated with the oxidation reaction was about 36-42 Kcal/mole, which was the same as in the YBa{sub 2}Cu{sub 3}O{sub x} system. The oxygen contents were found to have strong effects on the sample resistance and the superconducting transition temperature.
- Research Organization:
- Ohio State Univ., Columbus, OH (United States)
- OSTI ID:
- 5633498
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHASE STUDIES
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES