(a) Figure 4 shows a phase diagram for the MgO65wt%FeO ceramic which is solidified under the nonequilibrium condition. Evaluate (i) the liquidus temperature (ii) the non-equilibrium solidus temperature (iii) the freezing range (iv) the composition of the first solid form during solidification (v) the composition of the last liquid to solidify (vi) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 1800C (vii) the phase(s) present, the composition of the phase(s) and the amount of the phase(s) at 1600C. Figure 4: The equilibrium phase diagram for the Nb-W system. The dotted curve shows a nonequilibrium solidus