Rapid fluorination using polyvinylidene-difluoride (PVDF) for the synthesis of oxyfluoride Bi₂VO₅F_1−x

Abstract

The topotactic fluorination of Bi₄V₂O₁₁ to Bi₂VO₅F_1−x using polyvinylidene difluoride (PVDF) was investigated. The reaction proceeded rapidly at a moderate temperature of 400 °C. In situ XRD-DSC measurement revealed that fluorination initiated above 270 °C and reached near completion by 352 °C within minutes, beyond which prolonged heating led to sample decomposition. These results underscore the feasibility of achieving topotactic fluorination at moderate temperatures with rapid ionic kinetics in ionic conductors, presenting a promising strategy for synthesizing novel mixed-anion compounds via soft chemistry.