Compound Formation and Phase Equilibria in the System PbO-SiO2 |
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Authors: | R. M. SMART F. P. GLASSER |
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Affiliation: | Department of Chemistry, University of Aberdeen, Old Aberdeen, Scotland |
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Abstract: | Compound formation in the system PbO-SiO2 was studied; the results are contrasted with those previously reported. Fifteen binary phases, 4 of which had not been reported, were prepared in the present study. The new phases include Pb5Si8O21, an orthorhombic polymorph of PbSiO3, Pb3SiO5, and a high-SiO2 phase containing ∼ 60 mol% SiO2. It was shown that Pb3SiO5 is thermodynamically stable relative to Pb2SiO4 and 4PbO.SiO2 below 640±5°C. A revised phase equilibrium diagram is presented. |
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