Barium ferrate
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IUPAC name
Barium ferrate(VI)
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| Other names
Barium ferrate(2-)
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| Identifiers | |||
13773-23-4 
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| 3D model (Jmol) | Interactive image | ||
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| Properties | |||
| BaFeO4 | |||
| Molar mass | 257.17 g·mol−1 | ||
| Appearance | Dark red, opaque crystals | ||
| insoluble | |||
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |||
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.
The ferrate(VI) anion is paramagnetic due to its two unpaired electrons and it has a tetrahedral molecular geometry.
X-ray diffraction has been used to determine the orthorhombic unit cell structure (lattice vectors a ≠ b ≠ c, interaxial angles α=β=γ=90°) of nanocrystalline BaFeO4. It has a pnma space group (point group: D2h) with lattice parameters a=0.8880 nm, b=0.5512 nm and c=0.7214 nm. The accuracy of the X-Ray diffraction data has been verified by the lattice fringe intervals from High-Resolution Transmission Electron Microscopy (HRTEM) and cell parameters calculated from Selected Area Diffraction (SAED).
Infra-red peaks of barium ferrate are observed at 870, 812, 780 cm−1.
BaFeO4 has a magnetic moment of (3.20 ± 0.09) x Am2 (3.45 ± 0.1BM) with a Weiss constant of -89 K.
There are two methods for producing ferrate (VI): dry and wet synthetic methods.
The dry synthetic method is usually performed using a thermal technique. Primary experiments indicate an improvement in the purity of the synthesized barium ferrate by performing the reaction at low temperature in the absence of carbon dioxide and by rapidly filtering and drying the precipitate. Addition of a soluble sodium barium salt to an alkali metal ferrate solution produces a maroon precipitate of barium ferrate, a crystal which has the same structure as barium chromate and has approximately the same solubility.
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