The Nb–Sb system

Constitution of the systems {V,Nb,Ta}-Sb and physical properties of di-antimonides {V,Nb,Ta}Sb2

“…8); (2) powders of single-phase NbSb 2 were hot pressed at 900 C for 1 h, however, did not show any formation of liquid and were single-phase after hot processing. These two experiments are incompatible with the low temperature of 760 C reported by Lomnytska et al [6] for the peritectic formation of NbSb 2 , however, are fully consistent with the decomposition temperature of NbSb 2 as given by Melnyk et al [1] at 1080 C. Note that Lomnytska et al [6] also performed a similar experiment as described in (1) …”

“…7). Particularly, the decomposition temperatures of NbSb 2 (760 C) and Nb 5 Sb 4 (1020 C) reported by Lomnytska et al [6] are rather low compared to the results of Melnyk et al [1]. Although Lomnytska et al [6] were not aware of the publication by Melnyk et al [1], they independently confirmed Nb 3 Sb, Nb 5 Sb 4 and NbSb 2 as the only binary compounds.…”

“…Particularly, the decomposition temperatures of NbSb 2 (760 C) and Nb 5 Sb 4 (1020 C) reported by Lomnytska et al [6] are rather low compared to the results of Melnyk et al [1]. Although Lomnytska et al [6] were not aware of the publication by Melnyk et al [1], they independently confirmed Nb 3 Sb, Nb 5 Sb 4 and NbSb 2 as the only binary compounds. As far as the isothermal reactions presented by Lomnytska et al [6] are concerned, it seems that the older DTA data by Myzenkova et al [8] have been used, which served as the basis for the diagram in Massalski [7].…”

“…As far as the isothermal reactions presented by Lomnytska et al [6] are concerned, it seems that the older DTA data by Myzenkova et al [8] have been used, which served as the basis for the diagram in Massalski [7]. Lomnytska et al [6] removed the non verified phase "Nb 3 Sb 2 " together with its original reaction isotherm at 1140 C [8], changed the phases "NbSb" "Nb 4 Sb 5 " (both phases not verified) to Nb 5 Sb 4 and NbSb 2 , respectively, but kept the original isothermal reactions at 1020 C and 760 C from Myzenkova et al [8]. In order to remove the ambiguities on the reaction temperatures mentioned above, we designed and evaluated two experiments: (1) a sample in the two-phase region between Nb 5 Sb 4 and NbSb 2 was heat treated at 800 C for 2 months, and finally showed only Nb 5 Sb 4 and NbSb 2 as constituents (see Rietveld refinement in Fig.…”

“…Although Lomnytska et al [6] were not aware of the publication by Melnyk et al [1], they independently confirmed Nb 3 Sb, Nb 5 Sb 4 and NbSb 2 as the only binary compounds. As far as the isothermal reactions presented by Lomnytska et al [6] are concerned, it seems that the older DTA data by Myzenkova et al [8] have been used, which served as the basis for the diagram in Massalski [7]. Lomnytska et al [6] removed the non verified phase "Nb 3 Sb 2 " together with its original reaction isotherm at 1140 C [8], changed the phases "NbSb" "Nb 4 Sb 5 " (both phases not verified) to Nb 5 Sb 4 and NbSb 2 , respectively, but kept the original isothermal reactions at 1020 C and 760 C from Myzenkova et al [8].…”