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Influence of silver and excess copper on the formation and properties of 2223 (Bi, Pb)–Sr–Ca–Cu–O superconductor

Published online by Cambridge University Press:  08 February 2011

R.B. Tripathi ,
D.W. Johnson Jr.  and
D.A. Fleming
R.B. Tripathi*
Affiliation:
AT & T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
D.W. Johnson Jr.
Affiliation:
AT & T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
D.A. Fleming
Affiliation:
AT & T Bell Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974
*
a)Visiting scientist from National Physical Laboratory, New Delhi, India.
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Abstract

The effect of silver additions and excess copper on the sinterability and weak link behavior has been studied in the nominal composition Bi1.72Pb0.32Sr2Ca2Cu3Ox (Ag = 1−4 wt. %) and Bi1.72Pb0.32Sr2Cu3+yOx where y = 0.2−0.5, using magnetic susceptibility, XRD, and SEM methods. Ag additions enhance the weak link behavior, giving a magnetic susceptibility shoulder at 103 K. This shoulder became more prominent at high fields (35 Oe), and a low Tc phase became evident with 4 wt. % Ag additions. In contrast to stoichiometric compositions, samples containing excess copper demonstrated an enhancement of the sinterability and a large volume of 2223 phase even in calcined samples. XRD data and SEM analysis failed to detect any Cu-rich phase up to copper contents y = 0.4. However, in copper samples with y = 0.5, a small x-ray peak at 2θ = 48.5°has been observed corresponding to CuO.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 3 , March 1991 , pp. 455 - 458
Copyright
Copyright © Materials Research Society 1991

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