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Thermodynamics cml.postech.ac.kr/teaching.html Graduate Institute of Ferrous Technology (GIFT)

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1 Thermodynamics cml.postech.ac.kr/teaching.html Graduate Institute of Ferrous Technology (GIFT)

2 Q Why is Gibbs free energy called ‘free’? A Because it is that part of the energy which is in principle obtainable as mechanical work. N. K. Adam, Physical Chemistry, Clarendon Press, Oxford (1956) page 263.

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4 Allotropic Transition in Pure Iron

5 o o A B A B 1-x Gibbs free energy per mole Concentration x of B   free energy of mechanical mixture G* x Mechanical Mixture

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7 o o A B A B x Gibbs free energy per mole Composition   G{x} free energy of mechanical mixture ∆G M free energy of solution G*

8 o o A B A B x Gibbs free energy per mole Composition  1-x A  x B   G{x}

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