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Two-zone annealing of Tl0.5Pb0.5(Sr0.8Ba0.2)2Ca2Cu3Oy

Published online by Cambridge University Press:  03 March 2011

T.L. Aselage ,
E.L. Venturini ,
J.A. Voigt ,
D.L. Lamppa  and
S.B. Van Deusen
T.L. Aselage
Affiliation:
Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico 87185-0345
E.L. Venturini
Affiliation:
Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico 87185-0345
J.A. Voigt
Affiliation:
Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico 87185-0345
D.L. Lamppa
Affiliation:
Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico 87185-0345
S.B. Van Deusen
Affiliation:
Department 1153/MS 0345, Sandia National Laboratories, Albuquerque, New Mexico 87185-0345
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Abstract

Stable conditions have been identified for two-zone processing of the superconducting thallium cuprate Tl0.5Pb0.5(Sr0.8Ba0.2)2Ca2Cu3Oy. With P(O2) of 0.8 atm, P(Tl2O) of 4.4 × 10−3 atm, and a sample temperature of 920 °C, single-phase Tl0.5Pb0.5(Sr0.8Ba0.2)2Ca2Cu3Oy, is produced with a Tc of 115 K, complete diamagnetic shielding, and Meissner fraction greater than 70%. Although a small amount of melting occurs under these conditions, a comparison of the low-field diamagnetic shielding for these samples with samples of Pb- and Sr-free TlBa2Ca2Cu3Oy and Tl2Ba2Ca2Cu3Oy, suggests that such melting is not necessary to produce the triple-CuO2-layer superconductors.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 10 , October 1994 , pp. 2470 - 2473
Copyright
Copyright © Materials Research Society 1994

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References

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