ferraten.
/ˈfɛreɪt/, U.S. /ˈfɛˌreɪt/ Chemistry.
A salt containing oxyanions of iron in which it typically has a high oxidation number, often +6; any of these anions.Such anions have the formula FeO4n− where n is often 2 but may be 3 or 4. Cf. ferric acid n. at ferric adj. Compounds.
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ferrate1829
1829 J. Togno & E. Durand tr. H. Milne-Edwards & P. Vavasseur Man. Materia Medica v. 108 On this principle, calcareous salt kept in solution would be a ferrate of lime [Fr. ferrate de chaux].
1868 H. B. Jones & H. Watts Fownes's Man. Elem. Chem. (ed. 10) 457 A class of salts called ferrates.
1902 Brit. Med. Jrnl. 28 June 104/1 When used by the blood this [sc. nucleinate of iron] is changed to ammonium ferrate.
1940 G. H. J. Adlam & L. S. Price Higher School Certificate Inorg. Chem. (ed. 2) liii. 552 Potassium ferrate is formed (1) by fusing iron filings with potassium nitrate and extracting the melt with water, (2) by the electrolysis of potassium hydroxide solution [etc.].
1960 Proc. Royal Soc. A. 254 107 Iron appears to form only one tetrahedral oxyanion, FeO42−, the ferrate ion.
2007 M. Hernandez-Esparza et al. Environmental Chem. x. 247/2 The instability of ferrate in acidic aqueous solutions is unfortunate.
This entry has been updated (OED Third Edition, June 2014; most recently modified version published online March 2022).
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