Sol-gel process for preparation of YBa{sub 2}Cu{sub 4}O{sub 8} from acidic acetates/ammonia/ascorbic acid systems

Journal Article · Sat Mar 01 04:00:00 EST 1997 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(96)00191-2· OSTI ID:477162

Deptula, A; Lada, W; Olczak, T ^[1]; Goretta, K C ^[2]; Bartolomeo, A; Casadio, S ^[3]

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1. Inst. of Nuclear Chemistry and Technology, Warsaw (Poland)
2. Argonne National Lab., IL (United States). Energy Technology Div.
3. C.R.E. Casaccia, Rome (Italy)

YBa{sub 2}Cu{sub 4}O{sub x} 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 part of the sol. The resultant sols were gelled to a shard or a coating by evaporation at 60 C. Addition of ethanol to the sols facilitated formation of gel coatings, fabricated by a dipping technique, on Ag or glass or substrates. At 100 C, gels formed in the presence of ascorbic acid were perfectly amorphous, in contrast to crystalline acetate gels. The quality of coatings prepared from ascorbate gels was superior to that of acetate gel coatings.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 477162
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 3 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACETATES
AMMONIA
ASCORBIC ACID
BARIUM OXIDES
COPPER OXIDES
EXPERIMENTAL DATA
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
SOL-GEL PROCESS
TRANSITION TEMPERATURE
YTTRIUM OXIDES