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Calcium substituted Y‐Ba‐Cu‐O superconductors with enhanced Tc

Published online by Cambridge University Press:  28 February 2011

D. E. Morris ,
P. Narwankar ,
A. P. B. Sinha ,
K. Takano  and
V. T. Shum
D. E. Morris
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
P. Narwankar
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
A. P. B. Sinha
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
K. Takano
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
V. T. Shum
Affiliation:
2‐300 Lawrence Berkeley Laboratory, Berkeley CA 94920
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Abstract

The Tc of 124 is enhanced by Ca substitution: CaxY(1‐x)Ba2Cu4Oy prepared at 200 bar at 930°C shows Tc = 89 K for x = 0.1. The 124 phase remains stable with Ca substitution at P(O2) ≥ 50 bar. For P(O2) = 2‐16 bar, Ca substitution stabilizes a tetragonal 123 phase CaxY(1‐x)Ba2Cu4Oy, which shows a Tc (87 K for x = 0.2) comparable to that of unsubstituted orthorhombic 123. The synthesis of CaT‐123 has been achieved in oxygen overpressure as small as 1 bar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 237
Copyright
Copyright © Materials Research Society 1990

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References

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