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Question 10.11.1: Part of binary phase diagram is shown in Figure 10.28a. When...

Part of binary phase diagram is shown in Figure 10.28a. When a magnetic field is applied, the solubility of the β phase decreases, as shown by the dotted line. Using Gibbs free energy plots of the α and β phases, determine which phase has the larger magnetic susceptibility.

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The Gibbs free energy plots for the α and β phases are shown in Figure 10.28b. Since the solubility of β has decreased, its free energy curve must have decreased more than that of the α phase in order for the common tangent to move to the left. Hence, the β phase must have the larger magnetic susceptibility. As in the case discussed in Section 7.8, applying a magnetic field enlarges the region of stability of the phase with the higher magnetic susceptibility

10.28b

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