The activities and partial molar heats of mixing have been determined in the Fe-Ti system at 1600°C. The experimental teqhnique is the same as described in the paper on the Fe-V and Fe-V-Cr systems, which has been reported previously.
The selection of oxide crucible material for the alloy and the effect of a small amount of added substance for the purpose of lowering the oxygen partial pressure in the cell have been discussed. The system exhibits a negative deviation from the ideal behaviour. The results can be partially represented by the equation
logγ_Fe=-0.89N²_T1-0.48 (N_Fe≤0.10)
logγ_Ti=-2.29N²_Fe+0.53 (N_Ti≤0.10)