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Structure and composition in the superconductive Bi–Sr–Ca–Cu–O system

Published online by Cambridge University Press:  31 January 2011

A. H. Carim ,
A. P. M. Kentgens ,
J. H. T. Hengst ,
D. M. de Leeuw  and
C. A. H. A. Mutsaers
A. H. Carim
Affiliation:
Philips Research Laboratories, P. O. Box 80.000, 5600 JA Eindhoven, The Netherlands
A. P. M. Kentgens
Affiliation:
Philips Research Laboratories, P. O. Box 80.000, 5600 JA Eindhoven, The Netherlands
J. H. T. Hengst
Affiliation:
Philips Research Laboratories, P. O. Box 80.000, 5600 JA Eindhoven, The Netherlands
D. M. de Leeuw
Affiliation:
Philips Research Laboratories, P. O. Box 80.000, 5600 JA Eindhoven, The Netherlands
C. A. H. A. Mutsaers
Affiliation:
Philips Research Laboratories, P. O. Box 80.000, 5600 JA Eindhoven, The Netherlands
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Abstract

Characterization of superconducting Bi–Sr–Ca–Cu oxides has been carried out by electrical measurements, x-ray diffraction, conventional and high-resolution electron microscopy, and electron microprobe analysis. Nominal starting compositions with cation ratios of 1:1:1:2 and 2:2:1:2 show considerably different superconducting behavior. In both cases multiphase materials are formed. The predominant superconducting phase occurs as thin platelets with an orthorhombic, modulated structure. These particles often have edges aligned along [110], [100], and [010] directions and contain subgrain boundaries. Electron diffraction patterns and high-resolution micrographs taken along several zone axes are consistent with an incommensurate centered modulation along the b axis with a magnitude of 4.7 ± 0.1 times b. Unexpectedly, two distinct chemical compositions were found in platelets with the same apparent structure: Bi4Sr3Ca3Cu4O16±δ for the lower Tc phase in the 1:1:1:2 material, and Bi2Sr2CaCu2O8±δ for the isomorphic higher Tc phase present in the 2:2:1:2 samples.

Type
Articles
Information
Journal of Materials Research , Volume 3 , Issue 6 , December 1988 , pp. 1317 - 1326
Copyright
Copyright © Materials Research Society 1988

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References

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