Phase relations in the Fe-rich region of the Fe-Gd-Mo ternary system at 800 °C

A thermodynamic assessment of the Fe‐Gd‐Mo system

“…It should be pointed out that the λ‐phase has not been always detected even in binary Fe‐Mo system [9], probably due to the slow nucleation. The calculated single‐phase region τ is somewhat larger compared to that at 1473 K, but the maximum amount of Gd which can be dissolved in the τ‐phase is still 1–2 at.% less than the experimentally observed one [2]. The calculated composition range where the liquid exists only in the ternary space (not in any binary system) is in good agreement with the experimental findings.…”

“…6b) shows a stable λ‐phase (Fe 2 Mo) that is consistent with the binary Fe‐Mo assessment (Fig. 2, Table 3), although it was not found throughout the corresponding experimental section [2] (Fig. 6a).…”

“… (a) Experimental isothermal section of the Fe‐Gd‐Mo system at 1073 K [ 2 ] (circles: one phase, squares: two phases, triangles: three phases; L=liquid). (b) Calculated isothermal section of Fe‐Gd‐Mo at 1073 K. …”

“…However, the tie‐line τ+ L with the related tie‐triangles Fe 2 Gd+τ+ L and τ+ L +(Mo) is favoured over the experimental phase regions Fe 2 Gd+(Mo), Fe 2 Gd+(Mo)+ L , and Fe 2 Gd+τ+ (Mo). The indicated differences may be stipulated by the difficulty to investigate phase equilibria in the samples containing a liquid phase [2]. At the same time, the calculated diagram (Fig.…”

Fe-Gd-Mo (Iron-Gadolinium-Molybdenum)

“…The phase was treated as a stoichiometric phase. The ternary compound Gd(Fe,Mo) 12 (ThMn 12 -type, tetragonal, denoted 1:12 by [2001Rag], and by [2002Zin]) was described by a four-sublattice model. This allowed modeling the homogeneity range of the compound represented by Gd 1+n Fe 12−x−y Mo x ᮀ y , where ᮀ is a vacancy, 0 < n < 0.2, 1.3 < x < 3.7, and 0.6 < y < 0.9.…”