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Reaction pathways in the formation of the Tl–Ca–Ba–Cu superconducting phases

Published online by Cambridge University Press:  31 January 2011

E. Ruckenstein  and
C. T. Cheung
E. Ruckenstein
Affiliation:
Department of Chemical Engineering, State University of New York, Buffalo, New York 14260
C. T. Cheung
Affiliation:
Department of Chemical Engineering, State University of New York, Buffalo, New York 14260
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Abstract

The 2223, 1223, 1324, and 1122 phases in the Tl–Ca–Ba–Cu system were prepared from sample mixtures having the same stoichiometry as the final phase. Powder x-ray diffraction analysis was used to follow the formation of these phases at 867 °C for up to 2 h. The formation of the 2223 phase is shown to occur via the sequential transformations 2021 → 2122 → 2223. For the 1–2–2–3 and 1–3–2–4 samples, the sequential transformations 1021 → 2021 → 2122 → 2223 occur before the final 1223 and 1324 phases are obtained. For the 1122 phase the formation is preceded by the 1021 → 2021 → 2122 transformations. Using scanning electron microscopy, a phase with a glassy appearance was detected in many of the reacted samples. This “glassy” phase appears to be a precursor in the formation of the Tl–Ca–Ba–Cu phases.

Type
Articles
Information
Journal of Materials Research , Volume 4 , Issue 5 , October 1989 , pp. 1116 - 1122
Copyright
Copyright © Materials Research Society 1989

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References

REFERENCES

1Sheng, Z.Z. and Hermann, A.M.Nature 332, 138 (1988).CrossRefGoogle Scholar
2Hazen, R. M.Finger, L. W.Angel, R. J.Prewitt, C. T.Ross, N. L.Hadidiacos, C.G.Heaney, P.J.Veblen, D.R.Sheng, Z.Z.Ali, A. El, and Hermann, A.M.Phys. Rev. Lett. 60, 1657 (1988).CrossRefGoogle Scholar
3Bednorz, J.G. and Muller, K.A.Z. Phys. B64, 189 (1986).CrossRefGoogle Scholar
4Wu, M. K.Ashburn, J. R.Torng, C. J.Hor, P. H.Meng, R. L.Gao, L.Huang, Z.J.Wang, Y. Q. and Chu, C.W.Phys. Rev. Lett. 58, 908 (1987).CrossRefGoogle Scholar
5Michel, C.Hervieu, M.Borel, M.M.Grandin, A.Deslandes, F.Provost, J. and Raveau, B.Z. Phys. B68, 421 (1987).CrossRefGoogle Scholar
6Maeda, H.Tanaka, Y.Fukutomi, M. and Asano, T.Jpn. J. Appl. Phys. 27, L209 (1988).CrossRefGoogle Scholar
7Parkin, S.S.P.Lee, V.Y.Engler, E.M.Nazzol, A.I.Huang, T. C.Gorman, G.Savoy, R. and Beyers, R.Phys. Rev. Lett. 60, 2539 (1988).CrossRefGoogle Scholar
8Parkin, S. S. P.Lee, V. Y.Nazzal, A. I.Savoy, R.Beyers, R. and LaPlaca, S. J.Phys. Rev. Lett. 61, 750 (1988).CrossRefGoogle Scholar
9Hansen, M. and Anderko, K.Constitution of Binary Alloys, 2nd ed. (McGraw-Hill, New York, 1958).CrossRefGoogle Scholar
10Parkin, S.S.P.Lee, V.Y.Nazzal, A.I.Savoy, R.Huang, T.C.Gorman, G. and Beyers, R.Phys. Rev. B 38, 6531 (1988).CrossRefGoogle Scholar
11Ihara, H.Sugise, R.Hirabayashi, M.Terada, N.Jo, M.Hayashi, K.Negishi, A.Tokumoto, M.Kimura, Y. and Shimomura, T.Nature 334, 510 (1988).CrossRefGoogle Scholar
12Handbook of Chemistry and Physics, 60th ed., edited by Weast, R. C. and Astle, M. J. (CRC Press, Boca Raton, FL, 1979), p. B134.Google Scholar
13Handbook of Chemistry and Physics, 60th ed., edited by Weast, R. C. and Astle, M. J. (CRC Press, Boca Raton, FL, 1979), p. B59.Google Scholar