Stepwise topochemical fluorination of SrCrO3 perovskite via a super-structured oxide.

A topochemical reaction between SrCrO3 and polyvinylydene fluoride yields the new fluorinated phase SrCrO2.8F0.2. The transformation proceeds via a reduced oxide intermediate (SrCrO2.8) that can be isolated as a single phase by the reaction between SrCrO3 and g-C3N4. The fluoride ions randomly occupy anion sites despite an oxygen-vacancy ordered structure in SrCrO2.8.