Chemical preparation of powders and films for high temperature superconductors
A precipitation process has been developed to prepare precursor powders which can be calcined and sintered to form high critical temperature superconductors such as YBa/sub 2/Cu/sub 3/O/sub 7-x/. Precursor powders are prepared using a continuous precipitation system in which a solution containing highly soluble salts of the desired metal cations is rapidly and completely mixed with a solution containing precipitating anions such as hydroxide and carbonate ions. The resulting amorphous powder can be calcined to form submicron particles of desired superconducting phases which are useful in preparing inks for the ink-jet printing of superconducting interconnects. The powders can be redissolved in organic solvents to form solutions which can be used in spin or dip coating substrates with thin superconducting films. Finally, the powders have been used to prepare bulk ceramics which exhibit the highest reported critical currents of any chem-prep ceramics. Bulk samples prepared from chloride doped precursors exhibit large, oriented grains and extensive flux pinning. 11 refs., 8 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6957652
- Report Number(s):
- SAND-88-1030C; CONF-880408-35; ON: DE88015266
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCINATION
CERAMICS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DECOMPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FABRICATION
FILMS
HALIDES
HALOGEN COMPOUNDS
MICROSTRUCTURE
NITRATES
NITROGEN COMPOUNDS
ORGANIC SOLVENTS
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHYSICAL PROPERTIES
POWDERS
PRECIPITATION
PYROLYSIS
SALTING-OUT AGENTS
SEPARATION PROCESSES
SINTERING
SOLVENTS
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
SUPERCONDUCTIVITY
SYNTHESIS
THERMOCHEMICAL PROCESSES
THIN FILMS
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES