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Electron microscopy study of Pb-substitution in bulk Bi–Sr–Ca–Cu–O superconductors

Published online by Cambridge University Press:  31 January 2011

D. J. Werder ,
C. H. Chen ,
S. Jin  and
R. C. Sherwood
D. J. Werder
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
C. H. Chen
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
S. Jin
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
R. C. Sherwood
Affiliation:
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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Abstract

We present the results of an electron microscopy study of Pb-substitution in bulk Bi–Sr–Ca–Cu–O superconductors. We observe grains with c-axis lattice parameters of 30.8 Å (2212 phase), 36.7 Å (2223 phase), and 43.2 Å (2234 phase) containing no intergrowth defects. The existence of two separate incommensurate superstructures, Q1 and Q2, which were previously observed in Pb-doped ceramics and single crystals, has been confirmed in this study. It is found that superlattice reflections from the Q2,-modulated structure in the 2223 phase are much weaker than those from the Q2-modulation, whereas the diffraction intensities of the Q1- and Q2-modulations in the 2212 phase are similar. We also show that the periodicity along the b-axis of the Q2-modulation increases with increasing Pb-substitution, contrary to the implications of a previously suggested structural model.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 4 , Issue 4 , August 1989 , pp. 748 - 751
Copyright
Copyright © Materials Research Society 1989

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References

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