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Experimental phase equilibria studies of the PbO–SiO 2 system
Author(s) -
Shevchenko Maxim,
Jak Evgueni
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15208
Subject(s) - tridymite , liquidus , cristobalite , electron microprobe , lead oxide , phase (matter) , atmospheric temperature range , analytical chemistry (journal) , mineralogy , phase diagram , microanalysis , quenching (fluorescence) , quartz , materials science , chemistry , thermodynamics , metallurgy , organic chemistry , physics , chromatography , quantum mechanics , fluorescence
Phase equilibria of the PbO–SiO 2 system have been established for a wide range of compositions: (i) liquid in equilibrium with silica polymorphs (quartz, tridymite, and cristobalite) between 740°C and 1580°C, at 60‐90 mol% SiO 2 ; (ii) with lead silicates (PbSiO 3 , Pb 2 SiO 4 , and Pb 11 Si 3 O 17 ) and lead oxide (PbO) between 700°C and 810°C. A high‐temperature equilibration/quenching/electron probe X‐ray microanalysis (EPMA) technique has been used to accurately determine the compositions of the phases in equilibrium in the system. Significantly, no liquid immiscibility has been found in the high‐silica range, and the liquidus in this high‐silica region has been accurately measured. The phase equilibria information in the PbO–SiO 2 system is of practical importance for the improvement of the existing thermodynamic database of lead‐containing slag systems (Pb–Zn–Fe–Cu–Si–Ca–Al–Mg–O).