Phase equilibria, formation, crystal and electronic structure of ternary compounds in Ti–Ni–Sn and Ti–Ni–Sb ternary systems

The phase equilibria of the Ti–Ni–Sn and Ti–Ni–Sb ternary systems have been studied in the whole concentration range by means of X-ray and EPM analyses at 1073 K and 873 K, respectively. Four ternary intermetallic compounds TiNiSn (MgAgAs-type), TiNi2−xSn (MnCu2Al-type), Ti2Ni2Sn (U2Pt2Sn-type), and Ti5NiSn3 (Hf5CuSn3-type) are formed in Ti–Ni–Sn system at 1073 K. The TiNi2Sn stannide is characterized by homogeneity in the range of 50–47 at% of Ni. The Ti–Ni–Sb ternary system at 873 K is characterized by formation of three ternary intermetallic compounds, Ti0.8NiSb (MgAgAs-type), Ti5Ni0.45Sb2.55 (W5Si3-type), and Ti5NiSb3 (Hf5CuSn3-type). The solubility of Ni in Ti0.8NiSb decreases number of vacancies in Ti site up to Ti0.91Ni1.1Sb composition.

Graphical abstractIsothermal section of the Ti–Ni–Sn phase diagram and DOS distribution in hypothetical TiNi1+xSn solid solution.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Ti–Ni–Sn phase diagram was constructed at 1073 K. ► Four ternary compounds are formed: TiNiSn, TiNi2−xSn, Ti2Ni2Sn, and Ti5NiSn3. ► Three ternary compounds exist in Ti–Ni–Sb system at 873 K. ► The TiNi2Sb compound is absent.