Method for preparing barium fluorohalide-based crystal

摘要

A method for preparing barium fluorohalide-based crystal, which includes at least a step in which a halide aqueous solution (B) and aqueous solutions of a fluoride and a barium salt are mixed into a halide aqueous solution (A). The halide aqueous solution (B) contains the same halogen as that contained in the halide aqueous solution (A). In this method, halide ions are used efficiently rather than remaining to form a waste residue.