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Section III: Supplemental Literature Review

Mg-Sb (Magnesium-Antimony) H. Okamoto

The Mg-Sb phase diagram in [Massalski2] was redrawn from [1984Nay]. [1990Oka] pointed out an unlikely feature in this phase diagram, i.e., the metastable melting point of aMg3Sb2 cannot be defined uniquely when extrapolated from the liquidus curves on the Mg-rich and Sb-rich side unless thermodynamically unlikely sudden change of curvature is introduced in these liquidus curves. Figure 1 shows the Mg-Sb phase diagram calculated by [2009Pal]. Naturally, the problem described above is solved in this figure. Table 1 shows Mg-Sb crystal structure data.

Table 1 Phase (Mg) bMg3Sb2 aMg3Sb2 (Sb)

Fig. 1

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References 1984Nay: A.A. Nayeb-Hashemi and J.B. Clark, The Mg-Sb (Magnesium-Antimony) System, Bull. Alloy Phase Diagr., 1984, 5(6), p 579-584 1990Oka: H. Okamoto and T.B. Massalski, Thermodynamically Improbable Phase Diagrams, J. Phase Equilib. Diffus., 1990, 12(2), p 148-168 2009Pal: M. Paliwal and I.H. Jung, Thermodynamic Modeling of the Mg-Bi and Mg-Sb Binary Systems and Short-RangeOrdering Behavior of the Liquid Solutions, Calphad, 2009, 33, p 744-754

Mg-Sb crystal structure data Composition, at.% Sb

Pearson symbol

Space group

Strukturbericht designation

Prototype

0 38.1-40 37.9-40 100

hP2 cI80 hP5 hR2

P63/mmc Ia3 P3m1 R3m

A3 D53 D52 A7

Mg Mn2O3 La2O3 aAs

Mg-Sb phase diagram

Journal of Phase Equilibria and Diffusion Vol. 31 No. 6 2010