Interaction of Vanadium with Iron and Antimony at 870 and 1070 K



The isothermal sections of the phase diagram of the V–Fe–Sb ternary system have been constructed at 870 and 1070 K by means of X-ray and electron-probe microanalyzer (EPMA) analyses over the whole concentration range. The existence of the one ternary phase, VFeSb, with MgAgAs- and Ni2In-type structures was observed at 870 and 1070 K, respectively. The solid solution formed based on the binary Fe2–xSb (Ni2In-type) compound reaches up to 12 at.-% of V at 870 K and 40 at.-% at 1070 K, respectively. Differential scanning calorimetry (DSC) analysis, magnetic susceptibility measurements, and electronic structure calculations showed the absence of a VFeSb polymorph phase transition and indicate that the hexagonal phase is part of the VyFe2–xSb solid solution.