Subsolidus Phase Relationships in the System Fe ₂ O ₃ –Al ₂ O ₃ –TiO ₂ between 1000° and 1300°C

Abstract

Subsolidus phase equilibria in the system Fe 2 O 3 –Al 2 O 3 –TiO 2 were investigated between 1000° and 1300°C. 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 M 3 O 5 solid solution series between end members Fe 2 TiO 5 and Al 2 TiO 5 , (b) a miscibility gap along the Fe 2 O 3 –Al 2 O 3 binary, (c) an α‐M 2 O 3 ( ss ) ternary solid‐solution region based on mutual solubility between Fe 2 O 3 , Al 2 O 3 , and TiO 2 , and (d) an extensive three‐phase region characterized by the assemblage M 3 O 5 +α‐M 2 O 3 ( ss ) + Cor( ss ). A comparison of results with previously established phase relations for the Fe 2 O 3 –Al 2 O 3 –TiO 2 system shows considerable discrepancy.