Abstract
Thermal and X‐ray studies show that there is complete solid solution between MgO.Cr2O3 and MgO.Al2O3 and that the spinel solid solutions are stable with no exsolution down to temperatures as low as 510°C. There is no solid solution of excess Cr2O3 in MgO.Cr2O3 nor of MgO.Cr2O3 in Cr2O3. The join MgO.Cr2O3–Al2O3 is found to be nonbinary; compositions along that join yield mixtures of a chromium oxide‐alumina solid solution and a spinel solid solution on firing to temperatures high enough to promote solid‐state reaction. Chromium oxide loss by volatilization increases at higher temperature. At a given temperature, chromium oxide loss is found to vary directly with the partial pressure of oxygen in the furnace atmosphere and with the ratio of MgO to SiO2 in the charges heated.
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