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Magnetization measurements, between 2 and 850 °K, on RFe2, RFe3, R6Fe23 and R2Fe17 compounds, for R = Y, Lu or Gd, have confirmed their ferromagnetic (R = Y or Lu) or ferrimagnetic (R = Gd) character. The Lu2Fe17 compound shows a ferro-antiferromagnetic transition and a neutron diffraction study revealed an helical spin configuration. A distance dependence of the magnetic interactions between iron atoms as has been shown by Néel and Slater can explain this transition as well as the order temperatures variation.
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Givord et al. (1971) studied this question.
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