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Structure and magnetic properties of GexFe3−xO4 oxides

Oxides of the Ge x Fe 3−x O 4 system (x=0, 0.2, 0.4, 0.6, 0.8, 1.0) were studied at 4.2-295 K by x-ray diffraction, neutron diffraction, and magnetic methods. The crystal and magnetic structure parameters of polycrystalline samples were determined. The magnetization anomaly typical of magnetite near the Verwey temperature was observed for almost all the compositions used. It was found that in the case of GeFe 2 O 4 these anomalies may be caused not only by ordering of iron ions with different valences, but also by spontaneous distortions of the crystal structure