Experimental liquidus study of the binary PbO-ZnO and ternary PbO-ZnO-SiO2 systems.

Abstract Phase equilibria of the binary PbO-ZnO and ternary PbO-ZnO-SiO 2 systems have been experimentally investigated at 1033–1898 K (760–1625 °C) for oxide liquid in equilibrium with air and solid oxide phases: tridymite or cristobalite (SiO 2), willemite (Zn 2 SiO 4), zincite (ZnO), larsenite (PbZnSiO 4) and lead-zinc melilite (Pb 2 ZnSi 2 O 7) covering the ranges of concentrations not studied before. High-temperature equilibration on primary phase or inert metal (platinum) substrates, followed by quenching and direct measurement of the Pb, Zn and Si concentrations in the phases with the electron probe X-ray microanalysis (EPMA) has been used. Liquidus phase equilibrium data is essential for the development of the thermodynamic model. [ABSTRACT FROM AUTHOR]