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Some Electrical Properties of γ-Fe2O3 Ceramics

We have observed some electrical properties of γ-Fe2O3 ceramics made by oxidizing Fe3O4. The change in electrical resistance during the oxidation from Fe3O4 and the transformation to α-Fe2O3 are discussed first. The effects of additives and mechanical treatment on the transformation of γ-Fe2O3 to α-Fe2O3 were also studied, by measuring the electrical resistance. A high gas sensitivity was observed in γ-Fe2O3 ceramics, and the gas sensitivity decreased as the amount of α-Fe2O3 precipitated in the γ-Fe2O3 increased. The transformation to α-Fe2O3 could thus be investigated by evaluating the gas sensitivity.