Barium ferrate, BaFeO₃

Barium ferrate, BaFeO₃, is best produced by heating a mixture of ferric and barium hydroxides to 600° C. in a current of oxygen. It is a friable, black, amorphous substance, stable up to about 650° C. Cold water decomposes it slowly, warm water somewhat more rapidly, with evolution of oxygen. Acids readily effect its decomposition, yielding barium and ferric salts. If hydrochloric acid is used, free chlorine and oxygen are simultaneously liberated.