Tetrafluoroborate and Perovskite Materials: A Potential Advanced Technology Combination Tetrafluoroborate (BF4-) is a common anion that is used in a variety of applications including electrochemistry, catalysis, and as a fluoride ion source (F-). Tetrafluoroborate's unique chemical and physical properties make it a valuable material for many technological advancements. One of the most intriguing uses of tetrafluoroborate is in perovskite materials. Tetrafluoroborates As an anion in inorganic and organic chemistry The popularization of BF−4 has led to decreased use of ClO−4 in the laboratory as a weakly coordinating anion. With organic compounds, especially amine derivatives, ClO−4 forms potentially explosive derivatives. Disadvantages to BF−4 include its slight sensitivity to hydrolysis and decomposition via loss of a fluoride ligand, whereas ClO−4 does not suffer from these problems. Safety considerations, however, overshadow this inconvenience. With a formula weight of 86.8, BF