Experimental investigation of the Fe-Sn-Ti ternary isothermal section at 873Â K

The isothermal section of the Fe-Sn-Ti ternary system at 873 K was investigated over the whole composition range using X-ray diffraction and scanning electron microscopy with an energy dispersive spectrometer. Three ternary compounds Fe2SnTi, Fe5Sn9Ti6 and FeSnTi2 were observed. The crystal structure of FeSnTi2 is solved (Pearson symbol hP18, space group P6(_) 2 m) and Fe5Sn9Ti6 is a cubic structured ternary compound (Pearson symbol cF116, space group Fm3(_) m). The compound FeSnTi was found to have a hexagonal structure (Pearson symbol hP6, space group P63mc) in the as-cast sample and the 1273 K annealed sample rather than the reported cubic half-Heusler structure.