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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 P 2 m) and Fe₅Sn₉Ti₆ is a cubic

structured ternary compound (Pearson symbol cF116, space group Fm 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.
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