<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>15R‐BaFeO<sub>2</sub>F (I) and 15R‐BaFeO<sub>2.27</sub>F<sub>0.5</sub> (II) are prepared by low temperature fluorination of the precursor 15R‐BaFeO<sub>3‐d</sub>F<sub>0.2</sub> (III) using polyvinylidenedifluoride as a fluorination agent.</p> </abstract>