Q2 (45%). The melting (fusion) points of pure Germanium and pure Silicon are 940C and 14100C,...

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Q2 (45%). The melting (fusion) points of pure Germanium and pure Silicon are 940C and 14100C, respectively, and are with fully miscible in both solid and liquid states. Component Ge (A) Si (B) Tr (C) 940 1410 AG (J/mole) 36,800 30.3 T 50,600 30.1 T i. Construct the integral free energy curve for the solid solution at 1150C. Assume activity is equal to the mole fraction. At XB=0.5 determine (15 marks): AGA(s) and AGB(s); GA(S) GB(s) and AG for the solution; ii. Construct the integral free energy curves for liquid and solid solutions at 1000, 1150 and 1300C. Assume activity is given by mole fractions; at each temperature determine the liquidus and solidus compositions using the tangent method (15 marks). iii. Construct the liquidus-solidus phase diagram for the system using the explicit equations in the notes (15 marks). Q2 (45%). The melting (fusion) points of pure Germanium and pure Silicon are 940C and 14100C, respectively, and are with fully miscible in both solid and liquid states. Component Ge (A) Si (B) Tr (C) 940 1410 AG (J/mole) 36,800 30.3 T 50,600 30.1 T i. Construct the integral free energy curve for the solid solution at 1150C. Assume activity is equal to the mole fraction. At XB=0.5 determine (15 marks): AGA(s) and AGB(s); GA(S) GB(s) and AG for the solution; ii. Construct the integral free energy curves for liquid and solid solutions at 1000, 1150 and 1300C. Assume activity is given by mole fractions; at each temperature determine the liquidus and solidus compositions using the tangent method (15 marks). iii. Construct the liquidus-solidus phase diagram for the system using the explicit equations in the notes (15 marks). Q2 (45%). The melting (fusion) points of pure Germanium and pure Silicon are 940C and 14100C, respectively, and are with fully miscible in both solid and liquid states. Component Ge (A) Si (B) Tr (C) 940 1410 AG (J/mole) 36,800 30.3 T 50,600 30.1 T i. Construct the integral free energy curve for the solid solution at 1150C. Assume activity is equal to the mole fraction. At XB=0.5 determine (15 marks): AGA(s) and AGB(s); GA(S) GB(s) and AG for the solution; ii. Construct the integral free energy curves for liquid and solid solutions at 1000, 1150 and 1300C. Assume activity is given by mole fractions; at each temperature determine the liquidus and solidus compositions using the tangent method (15 marks). iii. Construct the liquidus-solidus phase diagram for the system using the explicit equations in the notes (15 marks).

Answer rating: 100% (QA)

i To construct the integral free energy curve for the solid solution at 1150C we need to calculate the free energy values for both components Ge and Si at that temperature Lets start with component A ... View the full answer