酸化鉄単結晶の還元試験

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The change of crystal structure during the reduction of iron oxide and the growth mechanism of fibrous iron were investigated. In order to elucidate the crystallographic transition of Fe_2O_3 during the reduction, platelets of Fe_2O_3 single crystal with flat (0001) plane (approx. 5 mm in width and 0.5 mm in thickness) were used as samples. Each of Fe_3O_4, FeO, and Fe was prepared by the reduction of the Fe_2O_3 sample at 750℃ in the CO-CO_2 mixture with an appropriate composition for each. The structures of the products were analyzed by X-ray diffraction including the Lane methods and scanning electron microscopy (SEM). The X-ray diffraction revealed that (0001) plane of Fe_2O_3 changed to (111) plane of Fe_3O_4 and (111) plane of FeO by epitaxial reactions. SEM revealed that as the reduction proceeded, steps parallel to (0001) plane of Fe_2O_3 appeared remarkably, and fibrous iron grew from some nuclei on the steps. The fibrous iron was never seen on (0001) plane of Fe_2O_3, and the direction of most active growth was [21^^-1^^-0] of Fe_2O_3.
社団法人日本鉄鋼協会の論文
1975-07-01