Synthesis of Y-Ba-Cu-O superconductors in subatmospheric oxygen

The YBa 2Cu 3O 7− x and YBa 2Cu 4O 8 phases were made from micron-size CuO, Y 2O 3, and BaCO 3 by a process that included conversion at 50 to 1000 Pa O 2 absolute. Thermogravimetric and X-ray analyses were used to characterize the conversion process. The process parameters included batch size, oxyge...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1991-03, Vol.174 (1), p.135-143
Main Authors: Lindemer, T.B., Washburn, F.A., MacDougall, C.S., Cavin, O.B.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Electrotechnical and electronic ceramics
Exact sciences and technology
Technical ceramics
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Summary:The YBa 2Cu 3O 7− x and YBa 2Cu 4O 8 phases were made from micron-size CuO, Y 2O 3, and BaCO 3 by a process that included conversion at 50 to 1000 Pa O 2 absolute. Thermogravimetric and X-ray analyses were used to characterize the conversion process. The process parameters included batch size, oxygen pressure, heating rate, final temperature, Y:Ba:Cu ratio, and CuO particle size. BaCuO 2 was generally the only detectable intermediate phase. Friable powders with 150- to 600-ppm carbon were produced without the intermediate grinding and firing common to atmospheric processes.
ISSN:0921-4534
1873-2143
DOI:10.1016/0921-4534(91)90429-3