Abstract
The crystal structures and the Fe sublattice magnetic ordering of RFe 6Ge 6 (R=Y, Lu, Hf) were studied by neutron powder diffraction. In all three compounds the Fe ordering is antiferromagnetic between 1.5 K and 293 K. The Fe moments have a collinear (+−+−⋯) arrangement along the hexagonal axis of the HfFe 6Ge 6 type of structure. The Fe moment value at 1.5 K is close to 1.8(1) μ B/Fe atom for all three compounds. It has been found that YFe 6Ge 6 forms a superstructure (with three Fe sites) described by the wave vector q=(1/2, 1/2, 0), of the orthohexagonal YCo 6Ge 6 type of structure (c, √3a, a) h which is associated with a density modulation of the Y/Ge ordering with the wave vector q. A deviation from the hexagonal HfFe 6Ge 6 structure was also detected for the LuFe 6Ge 6 compound. The occurrence of antiferromagnetism in conjunction with the absence of any short Fe–Fe distances in these compounds is discussed in relation to the Néel–Slater curve.
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