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Properties of Bi2Sr2CaCu2O8 thick films melt-processed at temperatures up to 950 °C

Published online by Cambridge University Press:  31 January 2011

W.C. McGinnis  and
J.S. Briggs
W.C. McGinnis
Affiliation:
Naval Ocean Systems Center, Code 573, San Diego, California 92152-5000
J.S. Briggs
Affiliation:
Naval Ocean Systems Center, Code 573, San Diego, California 92152-5000
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Abstract

Thick Bi2Sr2CaCu2O8 films have been produced by melting Bi2Sr2CaCu2O8 powder on MgO substrates at temperatures just above the melting temperature of the powder. X-ray diffraction measurements indicate enhanced c-axis alignment throughout the thickness of the films. Films melted at 900 °C show greater alignment and contain less Bi2Sr2CuO6 compared to those processed at 950 °C. Both the degree of alignment and the Bi2Sr2CuO6 content increase as the cooling rate is decreased. Transport measurements show that films quickly cooled from low melt-processing temperatures have the highest critical current densities (Jc = 13 kA/cm2 at 30 K). The temperature dependence of Jc is best described by a flux creep model. Finally, Jc at 4.2 K (in both parallel and perpendicular magnetic fields) undergoes a sudden drop at low fields, but levels off above 0.5 T to about 30% of the zero field value.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 3 , March 1992 , pp. 585 - 591
Copyright
Copyright © Materials Research Society 1992

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