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Phase Equilibria in the System Tl-Ca-Ba-Cu-O. I. Stability of the 2122 Phase Under Conditions of Oxygen Annealing

Published online by Cambridge University Press:  28 February 2011

L. P. Cook ,
C. K. Chiang ,
W. Wong-Ng ,
L. J. Swartzendruber  and
L. H. Bennett
L. P. Cook
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
C. K. Chiang
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
W. Wong-Ng
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
L. J. Swartzendruber
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
L. H. Bennett
Affiliation:
Materials Science and Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.
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Abstract

Results are presented for 850°C oxygen annealing experiments (up to 62 hr) on the 2122 (Tl:Ca:Ba:Cu) oxide phase, with and without intermediate grinding. Samples were characterized by powder X-ray diffraction and a.c. magnetic susceptibility. The 2122 phase appears to be thermodynamically stable in oxygen under conditions of both extensive grinding, and, annealing of long duration. However, onset Tc's vary from 71 K to 109 K for apparently single-phase 2122 samples with nearly identical X-ray powder patterns, depending upon the heat treatment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 169: Symposium M – High Temperature Superconductors: Fundamental Properties and Novel Materials Processing , 1989 , 137
Copyright
Copyright © Materials Research Society 1990

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References

1 Cook, L.P., Wong‐Ng, W., Chiang, C.K. and Bennett, L.H., Proceedings of the ACerS High Tc Symposium, Anaheim, CA, Nov. 1989, (submitted).Google Scholar
2 Matheis, D.P. and Snyder, R.L., Powd. Diff., submitted, 1989.Google Scholar