... at lower temperatures.Thermodynamics data indicate that the value of WH is 28.3kJ/mol in the expression for enthalpy of mixing Hmix = xs xT WH ,where xs is the mole fraction SnO2 and xT is the molefraction TiO2.
1.Culculate Hmix at xs =0 , 0.1 , 0.3 ,0.5 , 0.7 , 0.9 and 1 and plot your values on a graph of Hmix against composition ?
2.culuculate the entropy of mixing at the same compositions and add a curve for -Smix to your graph [Smix =-R[xsIn xs+ xT In xT] for random mixing of Sn and Ti on their sites].
3.calculate the gibbs energy of mixing for these compositions at temperatures T of 1550 degrees celucis ,1300 degrees celcous and 1000 degrees celcious .make another graph of these values ?
4.from this graph ,estimate the compositions of the co-exisisting phases in the two-phase region and hence plot the solvus on abinary phase diagram ?