One method that has proven effective for studying the short-range structure of heteroanionic materials is solidstate nuclear magnetic resonance (NMR) spectroscopy, which provides direct information about the local chemical environments of individual chemical species. In the case of oxyfluorides, the use of NMR spectroscopy is facilitated by the high gyromagnetic ratio and broad chemical shift range of the sole natural isotope of fluorine, 19 F, and several previous studies have used 19 F NMR spectroscopy to study oxygen-fluorine ordering in oxyfluorides . However, using 19 F NMR data alone to unambiguously determine O/F ordering in disordered oxyfluorides can be challenging, due to the large number of possible anion permutations that might need to be considered; as a consequence, complementary experimental or computational data are often required to fully solve the anion structure.