Preparation of superconducting wire by deposition of YBa sub 2 Cu sub 3 O sub x onto fibers
- Georgia Inst. of Tech., Atlanta, GA (USA)
- Oak Ridge National Lab., TN (USA)
A controllable process has been developed for chemical vapor deposition of superconducting YBa{sub 2}Cu{sub 3}O{sub x}. The process relies on feeding and transport of a finely ground powder mixture of Y, Ba, and Cu tetramethylheptanedionates into a CVD furnace. X-ray diffraction, scanning electron microscopy, analytical electron microscopy, analytical electron microscopy, resistance versus temperature, and critical current measurements have been used to characterize the films. The optimum processing parameters were determined using parametric studies involving temperature, pressure, reagent feed rate and composition, and coating time. Extensive c-axis orientation was observed using x-ray diffraction and transmission electron microscopy. The presence of impurity phases and substrate coating interaction layers were observed. YBa{sub 2}Cu{sub 3}O{sub x} coatings on MgO (100) single crystal substrates exhibited critical currents of 2 {times} 10{sup 4} A cm{sup 2} at 77 K, 0 Tesla, with critical temperatures (Resistance=)0 of 86 K. Deposition of the YBa{sub 2}Cu{sub 3}O{sub x} material onto several fibrous substrates has been achieved, and a continuous fiber coating furnace is in operation. 26 refs., 13 figs., 2 tabs.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- Sponsoring Organization:
- DOD; DOE/CE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6945203
- Report Number(s):
- CONF-901088-3; ON: DE90013380
- Country of Publication:
- United States
- Language:
- English
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426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL VAPOR DEPOSITION
COATINGS
CONTROL
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
CURRENT DENSITY
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
FILMS
FLUIDS
FURNACES
GASES
IMPURITIES
INTERFACES
MEASURING METHODS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROCESS CONTROL
REAGENTS
SPECTROSCOPY
SUBSTRATES
SUPERCONDUCTING WIRES
SURFACE COATING
TEMPERATURE EFFECTS
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
VAPORS
VERIFICATION
WIRES
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES