Effect of Al2O3 and Cr2O3 on loquidus temperatures in the cristobalite and tridymite primary phase fields of the MgO-"FeO"-SiO2 ststem in equilibrium with metallic iron

The effects of alumina and chromite impurities on the liquidus temperatures in the cristobalite/tridymite (SiO2) primary phase fields in the MgO-FeO-SiO, system in equilibrium with metallic iron have been investigated experimentally. Using high temperature equilibration and quenching followed by electron probe X-ray microanalysis (EPMA), liquiclus isotherms have been determined in the temperatures range 1 673 to 1 898 K. The results are presented in the form of pseudo-ternary sections of the MgO-FeO-SiO, system at 2, 3 and 5 wt% Al2O3, 2 wt% Cr2O3, and 2 wt% Cr2O3+2 wt% Al2O3. The study enables the liquidus to be described for a range of SiO2/MgO and MgO/FeO ratios. It was found that liquiclus temperatures in the cristobalite and tridymite primary phase fields, decrease significantly with the addition of Al2O3 and Cr2O3

Phase equilibria in the cristobalite, tridymite and pyroxene primary phase fields in the MgO-"FeO"-SiO2 system in equilibrium with metallic iron

Experimental studies have been carried out to determine the phase equilibria for the ternary MgO-"FeO"-SiO2, in equilibrium with metallic iron. Liquiclus isotherms have been determined in the temperature range from 1 578 to 1 898K in the silica and pyroxene primary phase fields using high temperature equilibration, modified quenching and electron probe X-ray microanalysis (EPMA) techniques

Phase equilibria in the olivine primary phase field in the MgO-"FeO"-SiO2 system in equilibrium with metallic iron

Liquidus isotherms and phase equilibria have been measured in the olivine primary phase field of the MgO-"FeO"-SiO2 system in equilibrium with metallic iron. Liquidus isotherms have been determined in the temperature range from 1523 to 1898 K. The tie lines between liquid and olivine solid solutions have been determined and the results were compared with those obtained in previous studies