The supported state of Fe³⁺ ions in supported iron oxides prepared from iron (III) nitrate and carriers and thermal evacuation effect on the supported iron oxides have been studied by the ESR method. Several different spectra were obtained for different carriers. Relatively sharp spectra obtained can be explained in terms of the difference in coordination states of Fe³⁺ ion. The absorption intensity on the sharp spectra is lower at higher evacuation ternperatures. Relatively broad spectra obtaind seem to be due to the cluster of the iron oxide on carrier surfaces. Their absorption intensity increases with increasing evacuation temperature and absorption centers shift at higher temperatures.

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