The thermodynamic assessment of the Co–Sb system

A Thermodynamic Modeling of the Fe–Nd–Sb System

“…It is reasonable to adopt the three-sublattice model in this study because FeSb has a hexagonal structure of the NiAs prototype, 2325) and this kind of three-sublattice model is used to describe the CoSb compound in the thermodynamic assessment of the CoSb binary system. 26,27) The thermodynamic parameters obtained by Zhang 6) were adopted in the present work, as the calculated results were in good agreement with the experimental data when the thermodynamic description by Zhang 6) was used. The Gibbs energy per mole of formula unit FeSb is expressed by Zhang 6) as follows: 35,37) NdFeSb 3 (LaPdSb 3 -type orthorhombic structure, denoted as¸4 here), 35,37) NdFe 1¹x Sb 2 (ZrCuSi 2 -type tetragonal structure, denoted aş 5 here), 35,38) and NdFe 4 Sb 12 (LaFe 4 P 12 -type cubic structure, denoted as¸6 here).…”

Thermodynamic assessment of the Co–Fe–Sb system

“…Therefore, the thermodynamic parameters reported by Ohnuma et al [12] for the Co-Fe system and by Zhang et al [13,14] for the CoSb system were adopted in the present work to assess the Co-Fe-Sb ternary system.…”

“…Okamoto [28] reviewed the most recent experimental phase diagram of the Co-Sb system and Tedenac et al [29] assessed the Co-Sb binary system using the CALPHAD method and reported the modeled phase diagram. Then, the phase equilibrium data and the thermodynamic properties of the Co-Sb binary system are summarized and thermodynamically assessed by Zhang et al [13,14].…”

“…And this kind of three-sublattice model is used already to describe the phase β(CoSb) of the Co-Sb binary system [13,14]. (2) The experimental heat capacities of both the nonstoichiometric compound β(FeSb) and the stoichiometric compound ζ 2 FeSb 2 [17,18] are considered to get a better fit to the experimental data.…”

“…Based on the literature reported Co-Fe, Co-Sb and Fe-Sb systems [12][13][14][15][16], the thermodynamic description of the CoFe-Sb ternary system is optimized together with the re-assessment of the Fe-Sb system, in which the obtained experimental heat capacities of both the non-stoichiometric compound β(FeSb) and the stoichiometric compound ζ 2 FeSb 2 [17,18] are paid special attention, and the activities of iron and antimony at 1423 K [19] are further considered.…”