lecture notes

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lecture notes slides available
on www.msm.cam.ac.uk/phase-trans /2003/iis/a.html
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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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Allotropic Transition in Pure Iron
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Mechanical Mixture
free energy of
mechanical
o
m
mixture
B
G
o
m
Gibbs free energy per mole
A
x
1-x
A
B
Concentration x of B
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free energy of
mechanical
o
m
mixture
B
G
o
Gibbs free energy per mole
m
A
?G
M
Gx
free energy
of solution
A
B
x
Composition
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o
m
B
o
m
A
Gibbs free energy per mole
Gx
A
B
x
Composition
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