Preparation of the high-Tc superconductor YBa/sub 2/Cu/sub 3/O(7-x) using organometallic precursors. Technical report
Organic soluble precursors to the high Tc 1-2-3 superconductor, YBa/sub 2/Cu/sub 3/O7-x, were prepared using polyesters derived from the interaction of citric acid (CA) or ethyl-enediaminetetraacetric acid (EDTA) with ethylene glycol. Mixtures of the nitrate, carbonate and/or acetate salts of the three metal ions with CA or EDTA and ethylene glycol were heated to obtain homogeneous green solids containing the desired 1:2:3 ratios of Y/sup 3 +/, Ba/sup 2 +/, and Cu/sup 2 +/ ions. Pyrolysis at 850C-960C in oxygen gave the superconducting, orthorhombic, YBa/sub 2/Cu/sub 3/O7-x phase. Films of the superconductor were prepared by dropping ethylene glycol solutions of these precursors onto zirconia and alumina substrates, followed by pyrolysis to 950 C in O/sub 2/. The results of TGA/DSC and FTIR studies of these precursors, as well as XRD, FTIR, pyrolysis/GC, electrical and magnetic-property measurements on the pyrolysis products are presented and discussed in the context of the probable precursor structures and pyrolysis chemistry.
- Research Organization:
- Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Chemistry
- OSTI ID:
- 6670064
- Report Number(s):
- AD-A-197422/9/XAB; TR-3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM COMPOUNDS
CUPRATES
COPPER COMPOUNDS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
CHEMICAL PREPARATION
YTTRIUM COMPOUNDS
ACETATES
CITRIC ACID
ELECTRICAL PROPERTIES
FILMS
INTERACTIONS
IONS
MAGNETIC PROPERTIES
METALS
MIXTURES
NITRATES
ORGANOMETALLIC COMPOUNDS
OXIDES
PROBABILITY
PROGRESS REPORT
PYROLYSIS
SALTS
SOLIDS
SOLUBILITY
SUBSTRATES
THIN FILMS
ALKALINE EARTH METAL COMPOUNDS
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
DOCUMENT TYPES
ELECTRIC CONDUCTIVITY
ELEMENTS
HYDROXY ACIDS
NITROGEN COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication