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Aurivillius-Popper mixed superconductors in BiO–CuO–(Sr0.5, Ca0.5)O system

Published online by Cambridge University Press:  31 January 2011

Mikio Fukuhara ,
Amar S. Bhalla ,
Laxman N. Mulay  and
Robert E. Newnham
Mikio Fukuhara
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
Amar S. Bhalla
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
Laxman N. Mulay
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
Robert E. Newnham
Affiliation:
The Pennsylvania State University, Materials Research Laboratory, University Park, Pennsylvania 16802
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Abstract

We report the effect of inhomogeneities on the electrical resistivity and ac magnetic susceptibility in Aurivillius-like bismuth mixed phase oxides of the BiO–CuO–(Sr0.5,Ca0.5)O system and propose a crystal structure of the major phase having highest Tc. Nominal Aurivillius compositions with molar ratios of BiO/(Sr0.5,Ca0.5)O = 1/2 are superconductors with Tc ranging from 83 to 107 K, and are accompanied by a large expansion during sintering due to the formation of Kirkendall voids. Tc increases with decreasing of the c lattice parameter. An oxide BiSrCaCu2Ox (n = 2) shows a maximum Tc value of 107 K and an onset of superconductivity at a much higher temperature. It seems that the structure of Bi2Sr2CaCu2Ox consists of an Aurivillius-like phase having two perovskite layers and a Popper mixed phase. The ac magnetic susceptibility showed an overall decrease in susceptibility with time up to 220 days. This appears to be related to the relief of intralattice strain.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 2 , April 1989 , pp. 273 - 282
Copyright
Copyright © Materials Research Society 1989

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References

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