This paper deals with the columbite FexMn1−xNb2O6
(x
= 0, 0.25, 0.50, 0.75 and 1) solid solution. After synthesis under vacuum, structural and magnetic properties were studied by means of X-ray diffraction, Rietveld refinement, electron paramagnetic resonance and magnetization measurements. This investigation showed that (i) the homogeneity range of the solid solution is complete and the A (Fe and/or Mn) cations are randomly distributed in the A-octahedral sites of the structure; (ii) the oxidation state of Fe and Mn is always +2; (iii) there is no cation disorder between the A and Nb sites; (iv) an antiferromagnetic transition is present only for the two end-members (FeNb2O6 and MnNb2O6).
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