Fig. 3: Mg-Nd solution behavior and equilibria of Mg reduction of Nd2O3. | Communications Materials

Fig. 3: Mg-Nd solution behavior and equilibria of Mg reduction of Nd2O3.

From: Magnesiothermic reduction of neodymium oxide through molten alloy non-ideality and hydride precipitation

Fig. 3: Mg-Nd solution behavior and equilibria of Mg reduction of Nd2O3.

a Activity coefficients of Mg and Nd as a function of composition in a binary Mg-Nd solution at 695 and 850 °C. b Activity of Mg and Nd in a binary Mg-Nd solution at 695 and 850 °C compared to the activity of an ideal Mg-Nd solution (dashed lines). The 695 °C series terminates at XNd = 0.136 because liquid Mg-Nd is not stable at this condition and Mg3Nd will begin to precipitate. c Gibbs energy of reduction of Nd2O3 to Mg-Nd solution as a function of solution composition at 850 °C, showing the effect of solution formation on the Gibbs energy compared to ΔG0 for the same reaction assuming no solution formation. The Gibbs energy for the reaction is also compared between ideal and non-ideal solutions, showing that the non-ideality of the solution increases the maximum amount of Nd able to be reduced and dissolved in the Mg-Nd alloy. d The maximum amount of Nd able to be reduced and dissolved into the Mg-Nd as a function of temperature comparing ideal and non-ideal solutions.

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