CONFIDENTIAL. Question 3 ( 25 marks) (a) Figure 4 shows a phase diagram for the MgO65 w?\% FeO ceramic, which is solidified under nonequilibrium conditions. Evaluate (i) the liquidus temperature (ii) the non-equilibrium solidus temperature (iii) the freezing range [2 marks] (iv) the composition of the first solid form during solidification [2 marks] [2 marks] (v) the composition of the last liquid to solidify |2 marks| (vi) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 1800C [t marks] (vii) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 1600C. [4 marks] Figure 4: The equilibrium phase diagram for the MgO-FeO system. The dotted curve shows a nonequilibrium solidus