Vanadium Iron Oxides

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Abstract
An investigation in the ternary system FeVO has been made of the chemical, crystallographic, and magnetic properties of the corundum FeVO3, and the spinels FeV2O4 and Fe2VO4· FeVO3 has been reported in the literature as Fe2+V4+O3 and antiferromagnetic at room temperature. However, the study reported in this paper shows that these results are incorrect. Oxidation of the spinel FeV2O4 results in the formation of some FeVO3. Conversely, reduction of FeVO3 ultimately forms FeV2O4+Fe. Therefore both the iron and vanadium are trivalent in the compound Fe3+V3+O3. Furthermore, FeVO3 has a small magnetic moment at room temperature which persists up to approximately 445°K as well as an anomalous rise in the magnetic moment below 150°K. A change in the relative intensity of several lines in the x‐ray pattern of the material, which may indicate a shift in the position of the metal atoms was observed down to liquid nitrogen temperatures. However, no change in the symmetry was observed. The magnetic properties of FeV2O4 and Fe2VO4 are also studied. The magnetization curves of both these materials indicate the existence of a magnetic transition at 275°K for Fe2VO4 and 70°K for FeV2O4.

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