Ferrate loosely refers to a material that can be viewed as containing anionic iron complexes. The term ferrate derives .
Examples include tetrachloroferrate (), oxyanions (e.g. ), and the organoferrates, including highly reduced tetracarbonylferrate () salts. Although rarely studied, ferrate(V) and ferrate(IV) ) oxyanions of iron also exist. These too are called ferrates.
Ferrate(VI) is a strong oxidizer, used in water purification and battery technology.
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