Abstract
UFe 10Mo 2 was obtained as single-phase polycrystalline material by annealing at 1450 K a polyphasic sample prepared by melting the elements. This compound was characterized by single-crystal X-ray diffraction, 57Fe Mössbauer spectroscopy and magnetization measurements. UFe 10Mo 2 was found to crystallize in the space group I4/ mmm with cell parameters a = 8.4859(3) A ̊ , c = 4.7508(2) A ̊ , V = 342.103(21) A ̊ 3, Z = 2 and a ThMn 12-type structure that was solved by single-crystal X-ray diffraction to a final R = 0.0345 ( wR = 0.0372). The Mo atoms are randomly distributed in the 8 i positions. Magnetization measurements show a ferromagnetic-like behaviour for T < 198 K and, in free powder, a saturation magnetization at low temperature of 8.8 μ B per formula unit. Comparison with fixed powder measurements indicates a basal plane type of anisotropy. 57Fe Mössbauer spectra below T c show a distribution of hyperfine fields from 0 to 20 T. This distribution was analysed considering the different local configurations around each Fe atom and assuming the Fe site distribution deduced from X-ray data.
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