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Effects of oxygen pressure on the structure of Y–Ba–Cu–O materials formed by containerless melting and solidification

Published online by Cambridge University Press:  03 March 2011

J.K.R. Weber ,
P.C. Nordine ,
K.C. Goretta  and
R.B. Poeppel
J.K.R. Weber
Affiliation:
Containerless Research, Incorporated, Evanston, Illinois 60201-3149
P.C. Nordine
Affiliation:
Containerless Research, Incorporated, Evanston, Illinois 60201-3149
K.C. Goretta
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439-4838
R.B. Poeppel
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439-4838
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Abstract

YBa2Cu3Ox ceramic superconductors were levitated, laser-beam melted, and undercooled in pure oxygen, dry air, and pure argon atmospheres. Solidified material from this containerless melting was examined by electron microscopy and x-ray diffraction analysis. The solubility of yttrium oxide in the melt was found to depend on ambient oxygen pressure such that complete dissolution was readily achieved in argon, but not in oxygen. The material formed in argon could be deeply undercooled and resolidified to produce a fine-grained and chemically homogeneous material. Use of ambient oxygen pressure to control the product morphology is discussed.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 7 , July 1994 , pp. 1657 - 1660
Copyright
Copyright © Materials Research Society 1994

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