What does ferrate mean?
In chemistry, ferrate denotes a compound or ion involving iron at a high oxidation state, most commonly the tetraoxoferrate(VI) ion, FeO4²⁻, and salts containing it. The unqualified name is especially associated with ferrate(VI), although oxidation-state labels are used when other iron oxoanions are discussed. Ferrates are not ordinary iron salts: the +6 state gives them strong oxidizing properties, which is why sodium ferrate and related compounds are studied for water treatment and other oxidation processes. The word is specialized and normally appears in inorganic chemistry, environmental chemistry, or materials science. Its derivation from Latin ferrum, “iron,” connects it with a family of English terms such as ferric, ferrous, and ferrite, but these words describe related iron substances rather than interchangeable names for ferrate.
nounA chemical compound or ion containing iron in the +6 oxidation state, especially the tetraoxoferrate(VI) ion, FeO4²⁻, or one of its salts.
- A chemical compound or ion containing iron in the +6 oxidation state, especially the tetraoxoferrate(VI) ion, FeO4²⁻, or a salt containing that ion.
"Sodium ferrate is a powerful oxidizing agent used in advanced water-treatment research."
"The reaction produced ferrate(VI), one of the most powerful oxidizing agents known in aqueous solution."
"Researchers are studying sodium ferrate as a more environmentally benign alternative to conventional water-treatment oxidants."
Used when referring to multiple iron(VI) oxoanions or their salts.
"Several ferrates are highly reactive and must be handled under carefully controlled conditions."
Ferrate(VI) puts iron at oxidation state +6, turning one familiar metal into a formidable oxidizing agent.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does ferrate come from?
Ferrate was formed within English chemical nomenclature from Latin ferrum, meaning “iron,” and the chemical suffix -ate. It belongs to a broader group represented by ferric, ferrous, and ferrite, all of which trace back to ferrum. Modern usage commonly specifies the oxidation state, as in ferrate(VI), because several iron oxoanions share the same stem.
How ferrate is actually used
This is specialized inorganic-chemistry terminology. The oxidation state is often specified as ferrate(VI) when other iron oxoanions are under discussion. It is not a general synonym for any iron-containing salt.
Easily confused with ferrate
A ferrate is an iron oxoanion or salt conventionally associated with FeO4²⁻, whereas a ferrite is an iron oxide, hydroxide, or iron-based magnetic phase rather than the tetraoxoferrate(VI) ion.