Abstract
The U x Fe 6Sn 6 (0≤ x≤0.6) intermetallics were prepared as polycrystalline samples by arc melting followed by annealing. They crystallize in the P6/ mmm space group as a lacunary variant of the HfFe 6Ge 6-type, with an ordered insertion of U within the Sn 8 voids of the FeSn framework, and are isostructural with the R x Fe 6Sn 6 compounds (R=Sc, Zr, Tm, Yb, Lu). 57Fe Mössbauer spectroscopy shows that the Fe magnetic moments, μ Fe, are already ordered at room temperature. Anisotropic contributions to the total hyperfine field at the Fe site indicates that μ Fe are perpendicular to the crystallographic c axis in contrast to the Sc, Zr and rare-earth (except Yb) containing compounds, where μ Fe are directed along the c axis. The values deduced for the angles between the main axes of the electric field gradient and μ Fe further show that, within each (001) plane, μ Fe have a ferromagnetic arrangement similar to that in FeSn and Yb 0.6Fe 6Sn 6. In U x Fe 6Sn 6, the hyperfine fields increase with U content. Magnetization data in the 2–300 K show small ferromagnetic components for the U 0.4Fe 6Sn 6 and U 0.6Fe 6Sn 6 compositions.
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