Barium ferrate

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What Wikipedia says

Barium ferrate is the chemical compound of formula BaFeO4. This is a rare compound containing iron in the +6 oxidation state. The ferrate(VI) ion has two unpaired electrons, making it paramagnetic. It is isostructural with BaSO4, and contains the tetrahedral [FeO4]2− anion.

Excerpt from the Wikipedia article “Barium ferrate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rrausch1974, CC BY-SA 3.0, via Wikimedia Commons.