Question: Show that the expressions given in the text for the critical temperature of a first-order phase transition [Equation (4.19)] and for the abrupt order parameter

Show that the expressions given in the text for the critical temperature of a first-order phase transition [Equation (4.19)] and for the abrupt order parameter change of η = ±(3B/4C)½ at Tc are consistent with the definition that the three minima in the Gibbs energy curve are equal to G0 at T(Figure 4.17).

Equation (4.19)

Te To + 3 B 16 aC

Figure 4.17

-17 T

Te To + 3 B 16 aC

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