Thermoelectric Determination of Cation Distributions in

Thermoelectric coefficient measurements in the system Fe 3 O 4 ‐Fe 2 TiO 4 were used to determine the cation distributions from 600° to 1300°C. The cation distributions obeyed the relation ‐RT In K=‐9.61+2(‐0.0154 T ) b +0.0256 T (kJ/mol) where K Fe cd is the iron distribution constant and b is the tetrahedral Fe 3+ concentration. Low‐temperature extrapolations agreed with experimental magnetometry and lattice parameter results. With the incorporation of a subregular size‐mismatch term, agreement with high‐temperature thermodynamic data was achieved. A solvus at intermediate temperatures was correctly predicted by the model.