The System MgO‐Cr ₂ O ₃ −Fe ₂ O ₃ at 1300°c in Air

Abstract

Phase relations in air at 1300°C were determined for the system MgO‐Cr 2 O 3 −Fe 2 O 3 by conventional quenching techniques. Details of the phase equilibria were established for: (1) the sesquioxide solid solution between Cr 2 O 3 and Fe 2 O 3 , (2) the spinel solid solution field between MgCr 2 O 4 and MgFe 2 O 4 , and (3) the periclase solid solution field for MgO. Selected tie lines connecting coexisting compositions were established with X‐ray diffractometer data. Diffuse reflectance spectra, diffractometer intensity ratios, and lattice parameter measurements were obtained for quenched samples to study the structural inversion in the spinel series MgCr 2 O4‐MgFe 2 O 4 .