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

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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 ... continued below

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15 p.

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Deptula, A.; Lada, W.; Olczak, T.; Goretta, K.C.; Di Bartolomeo, A. & Casadio, S. August 1, 1995.

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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.

Physical Description

15 p.

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INIS; OSTI as DE96005518

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  • 8. international workshop on glasses and ceramics from gels, Faro (Portugal), 18-22 Sep 1995

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  • Other: DE96005518
  • Report No.: ANL/ET/CP--85943
  • Report No.: CONF-9509289--2
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 195645
  • Archival Resource Key: ark:/67531/metadc669917

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  • August 1, 1995

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  • June 29, 2015, 9:42 p.m.

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  • June 27, 2016, 1:18 p.m.

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Deptula, A.; Lada, W.; Olczak, T.; Goretta, K.C.; Di Bartolomeo, A. & Casadio, S. 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, article, August 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc669917/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.