Iron(III) Fluoride

Khaki powder

D50: 10-20 microns

Used for cathode material of lithium battery

Only sparingly soluble in water and insoluble in alcohol and ether.

When heated in hydrogen it is reduced to iron(II) fluoride and thence to the metal.

In the presence of alkali metal fluorides, complex fluorides of types MFeF4, M2FeF5.

xH2O and M3FeF6 can be crystallized.

The magnetic behaviour of FeF3 is complicated; between 63° and 293°K the susceptibility is field strength dependent.

The trihydrate has a magnetic moment μ = 2-25 B.M. at 300°K.