The antimony-niobium (Sb-Nb) system
Tóm tắt
A constitutional diagram was established for the Nb-Sb system in the region with more than 30 at. % Sb and below 1450 °C. Investigation of the phase relations was based on differential thermal analysis (DTA), light optical microscopy, electron probe microanalysis, and X-ray diffraction experiments on argon arc melted bulk alloys, which were annealed at 600 °C in vacuum-sealed silica capsules up to 1400 h. Differential thermal analysis runs (5 to 20 K/min, T
max=1450 °C) were performed on alloys vacuum sealed in Ta crucibles with an inner lining of W. In contrast to earlier claims for the existence of five binary phases, Nb3Sb, Nb3Sb2, NbSb, Nb5Sb4 (or Nb4Sb3), and NbSb2, the authors observed only three binary compounds: Nb3Sb, Nb5Sb4, and NbSb2. These compounds are essentially line compounds at their stoichiometric composition and without a significant homogeneity region at 600 °C. All compounds are formed by peritectic reactions: L+(Nb)↔Nb3Sb (1750±25 °C, (L℞55 at.% Sb), L+Nb3Sb↔Nb5Sb4 (1320±10 °C, L℞71 at.% Sb), and L+Nb5Sb4↔NbSb2 (1180±10 °C, L℞88 at.% Sb). The system is characterized by a depleted eutectic reaction L↔(Sb)+NbSb2 at 618±8 °C and L℞99 at.% Sb.
Tài liệu tham khảo
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