Quaternary system SrO-CaO-BaO-CuO at 950 C. 1: Phase relationships in the limiting ternary system SrO-CaO-CuO
- Univ. Claude Bernard-Lyon I, Villeurbanne (France). Physicochimie des Materiaux Luminescents
- Univ. de Savoie (France). Lab. de Structure de la Matiere
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){sub m}Sr{sub 2}Ca{sub n{minus}1}Cu{sub n}O{sub x}. Mixtures (Sr/Ba)O-CaO-CuO are used as precursors in their elaboration. In the first stage of their 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.
- OSTI ID:
- 522370
- Journal Information:
- Materials Research Bulletin, Vol. 32, Issue 8; Other Information: PBD: Aug 1997
- Country of Publication:
- United States
- Language:
- English
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