Quaternary system SrO-CaO-BaO-CuO at 950 °C: I. Phase relationships in the limiting ternary system SrO-CaO-CuO

Knowledge of the succession of phases in dependence on composition and temperature is essential in order to control the formation of pure superconducting thallium-based cuprates (Tl/Pb) mSr 2Ca n−1Cu nO x. Mixtures (Sr/Ba)OCaOCuO are used as precursors in their elaboration. In the first stage of o...

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Bibliographic Details
Published in:Materials research bulletin 1997, Vol.32 (8), p.1017-1026
Main Authors: Lebbou, K., Abraham, R., Trosset, S., Jorda, J.L., Cohen-Adad, M.Th
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Others (including liquid-liquid-vapor equilibria)
Phase equilibria
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Summary:Knowledge of the succession of phases in dependence on composition and temperature is essential in order to control the formation of pure superconducting thallium-based cuprates (Tl/Pb) mSr 2Ca n−1Cu nO x. Mixtures (Sr/Ba)OCaOCuO are used as precursors in their elaboration. In the first stage of our investigation, the ternary system SrOCaOCuO has been reinvestigated at 950 °C, in order to determine precisely the phase relationships in the ternary subsystem. In the second stage, the study will be extended to the quaternary BaOSrOCaOCuO system. The present paper reports the results concerning the polyphased fields in the ternary system under isothermal conditions at 950 °C under 1 bar of oxygen. A comparison with literature data shows that new domains are observed. Solid phases mentioned in the literature are confirmed, but the observed three phases equilibria are not the same
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(97)00075-5