Subsolidus phase relationships in the system Fe2O3-Al2O3-TiO2 between 1000° and 1300°C

Subsolidus phase equilibria in the system Fe2O3-Al2O3-TiO2 were investigated between 1000degrees and 1300degreesC. Quenched samples were examined using powder X-ray diffraction and electron probe microanalytical methods. The main features of the phase relations were: (a) the presence of an M3O5 solid solution series between end members Fe2TiO5 and Al2TiO5, (b) a miscibility gap along the Fe2O3-Al2O3 binary, (c) an alpha-M2O3(ss) ternary solid-solution region based on mutual solubility between Fe2O3, Al2O3, and TiO2, and (d) an extensive three-phase region characterized by the assemblage M3O5 + alpha-M2O3(ss) + Cor(ss). A comparison of results with previously established phase relations for the Fe2O3-Al2O3-TiO2 system shows considerable discrepancy.