Sol-gel process for preparing YBa{sub 2}Cu{sub 4}O{sub 8} precursors from Y, Ba, and Cu acidic acetates/ammonia/ascorbic acid systems
- Inst. of Nuclear Chemistry and Technology, Warsaw (Poland)
- Argonne National Lab., IL (United States). Energy Technology Div.
- ENEA, Rome (Italy)
Sols were prepared by addition of ammonia to acidic acetate solutions of Y{sup 3+}, Ba{sup 2+}, and Cu{sup 2+}. Ascorbic acid was added to a part of the sol. The resultant sols were gelled to a shard, a film, or microspheres by evaporation at 60 C or by extraction of water from drops of emulsion suspended in 2-ethylhexanol-1. Addition of ethanol to the sols facilitated the formation of gel films, fabricated by a dipping technique, on glass or silver substrates. At 100 C, gels that were formed in the presence of ascorbic acid were perfectly amorphous, in contrast to the crystalline acetate gels. Conversion of the amorphous ascorbate gels to final products was easier than for the acetate gels. The quality of coatings prepared from ascorbate gels was superior to that of acetate gel coatings.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Polish State Committee for Scientific Research (Poland)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 195645
- Report Number(s):
- ANL/ET/CP-85943; CONF-9509289-2; ON: DE96005518; TRN: 96:008317
- Resource Relation:
- Conference: 8. international workshop on glasses and ceramics from gels, Faro (Portugal), 18-22 Sep 1995; Other Information: PBD: Aug 1995
- Country of Publication:
- United States
- Language:
- English
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