Experimental study of phase equilibria in the PbO-Al2O3-SiO2 system

Equilibrium phase relations in the PbO-AlO-SiO system have been investigated experimentally by means of high-temperature equilibration, quenching, and electron probe X-ray microanalysis (EPMA). The system has 21 primary phase fields including three monoxides (PbO, AlO, and SiO), seven binary compounds (AlSiO, PbAlO, PbAlO, PbAlO, PbSiO, PbSiO, and PbSiO), and eleven ternary compounds (PbAlSiO, PbAlSiO, PbAlSiO PbAlSiO, PbAlSiO, PbAlSiO, PbAlSiO, PbAlSiO, PbAlSiO, PbAlSiO, and PbAlSiO). Three new ternary compounds, PbASiO, PbAlSiO, and PbAlSiO, were observed and characterized by EPMA. No extensive solid solution in any of the compounds was found in the present study. The liquidus isotherms were experimentally determined in most of the primary phase fields in the temperature range from 923 to 1873 K, and the ternary phase diagram of the PbO-AlO-SiO system has been constructed