Thermodynamic Properties of Fe3O4‐FeAl2O4 Spinel Solid Solutions

The Gibbs energy of mixing for the system Fe3O 4 ‐FeAl 2 O 4 was determined at 1573 K using a gas‐metal‐oxide equilibration technique. Oxide solid solution samples were equilibrated with Pt foils under controlled CO+CO 2 gas streams. The equilibrium iron concentration in the foil was determined by chemical analysis. The cation distribution between tetrahedral and octahedral sites in the spinel crystal can be calculated from site‐preference …