A magnetochemical study of sodium ferrate samples obtained by heating sodium peroxide and iron(III) oxide at about 480 0C and in a 10 :1 molar ratio of sodium to iron has shown that there exists a phase of iron in a higher oxidation state which, in terms of quenched orbital magnetism theory, can be considered as a high-spin oxocomplex of tetravalent iron, which is antiferromagnetic with a Neel temperature of about 14 K.
L. A. Ponomarenko, S. K. Dedushenko, Y. M. Kiselev and N. A. Chumaevsky, Mendeleev Commun., 1998, 8, 189 DOI: 10.1070/MC1998v008n05ABEH000975
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