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Control of Microstructures in the YBA2CU3O7‐σ system: 1. Reaction with CO2

Published online by Cambridge University Press:  28 February 2011

Angus I. Kingon ,
Cheryl D. Davis ,
Thomas M. Hare ,
Hayne Palmour III ,
Carl C. Koch  and
D.G. Haase
Angus I. Kingon
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695‐7907
Cheryl D. Davis
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695‐7907
Thomas M. Hare
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695‐7907
Hayne Palmour III
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695‐7907
Carl C. Koch
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695‐7907
D.G. Haase
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695‐8202
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Abstract

Controlled reactions have been undertaken between CO2 and polycrystalline YBa2Cu3O7‐σ in the temperature range 500°‐700°C. Typical reaction products are Y2BaCu05, BaC03 and CuO. Subsequent processing in O2 (e.g. sintering) results in the formation of liquid phases(s) by peritectic reaction at temperatures of 935‐975°C, well below the incongruent melting point of YBa2Cu3O7‐σ (∼1010°C). This “low temperature” liquid phase is shown to have a dramatic influence on the sintering process, and the resulting microstructures. The reactions are difficult to reverse even after extended times at temperatures >900°C. The results give an indication of the effect of adsorbed CO2 into YBa2Cu3O7‐σ powders, albeit on a more localized scale.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 253
Copyright
Copyright © Materials Research Society 1990

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References

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