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Equilibrium phase diagram for the system PbO-CaO-CuO

Published online by Cambridge University Press:  31 January 2011

Hitoshi Kitaguchi ,
Jun Takada ,
Kiichi Oda  and
Yoshinari Miura
Hitoshi Kitaguchi
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Okayama University, Okayama 700, Japan
Jun Takada
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Okayama University, Okayama 700, Japan
Kiichi Oda
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Okayama University, Okayama 700, Japan
Yoshinari Miura
Affiliation:
Department of Applied Chemistry, Faculty of Engineering, Okayama University, Okayama 700, Japan
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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.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 5 , May 1990 , pp. 929 - 931
Copyright
Copyright © Materials Research Society 1990

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References

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