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Equilibrium phase diagram for the system PbO-CaO-CuO

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Abstract

In order to obtain essential information on the formation process of the high-Tc phase in the Bi, Pb-Sr-Ca-Cu-O system, phase equilibria in the system PbO-CaO-CuO have been studied, mainly by x-ray diffraction analysis and thermal analysis. Temperature versus composition diagrams were established for the systems PbO-CuO(Cu2O) and PbO(PbO2)–CaO in air. Three invariant points were detected in these systems: a eutectic reaction (PbO + Ca2PbO4 = L) at 847 ± 6°C, a peritectic reaction (Ca2PbO4 = L + CaO) at 980 ± 2°C, and a eutectic reaction (PbO + CuO = L) at 789 ± 3°C. For the system PbO(PbO2)-CaO-CuO, subsolidus phase equilibrium in air was established. The liquidus was also examined at 780, 800, and 820°C, and a ternary (PbO-Ca2PbO4-CuO) eutectic point was detected at 772 ± 6°C.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Engineering, Okayama University, 700, Okayama, Japan

    Hitoshi Kitaguchi, Jun Takada, Kiichi Oda & Yoshinari Miura

Authors
  1. Hitoshi Kitaguchi
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  2. Jun Takada
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  3. Kiichi Oda
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  4. Yoshinari Miura
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Kitaguchi, H., Takada, J., Oda, K. et al. Equilibrium phase diagram for the system PbO-CaO-CuO. Journal of Materials Research 5, 929–931 (1990). https://doi.org/10.1557/JMR.1990.0929

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  • DOI: https://doi.org/10.1557/JMR.1990.0929

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