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 Tc (Figure 4.17).
Equation (4.19)

Figure 4.17

Te To + 3 B 16 aC
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