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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

  • L. P. Cook (a1), C. K. Chiang (a1), W. Wong-Ng (a1), L. J. Swartzendruber (a1) and L. H. Bennett (a1)...

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.

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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).
2 Matheis, D.P. and Snyder, R.L., Powd. Diff., submitted, 1989.

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

  • L. P. Cook (a1), C. K. Chiang (a1), W. Wong-Ng (a1), L. J. Swartzendruber (a1) and L. H. Bennett (a1)...

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