033ChemInform Abstract A novel method of preparation of the title compounds Na4FeO5, K2FeO4 and Cs2FeO4 is described, which affords these free of any impurity. Fe is present exclusively in the hexavalent state, as is evidenced by Moessbauer spectra. The title compounds are prepared from the alkali peroxides and Fe2O3 in a stream of oxygen at elevated temperatures. The conditions necessary for the preparation of pure samples are determined in detail. They are to be strictly regarded.

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