Phase Equilibrium in the System PbO-TiO2–ZrO2 |
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| Authors: | SHOICHI FUSHIMI TAKURO IKEDA |
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| Affiliation: | Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation, Musashino, Tokyo, Japan |
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| Abstract: | Phase equilibrium relations in the system PbO–TiO2–ZrO2 were studied by quenching in the range where the PbO content is 50 mole % and more. Isotherms were examined at 1100°, 1200°, and 1300°C and tie lines were determined between the liquid and solid solution in equilibrium. The incongruent melting point of PbZrO3 was 1570°C and the equilibrium between liquid, PbO-type solid, and PbZrO3 is peritectic. Pb(Zr,Ti)O3 solid solutions containing more than 14 mole % PbZrO3 decomposed to liquid, ZrO2, and Pb(Zr,Ti)O3 and the decomposition temperature rises from 1340° to 1570°C with increasing PbZrO3 content. The system PbTiO3–PbZrO3 should not be treated as a binary, but as a section of the ternary system. |
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