Abstract: Barium fluoride (BaF₂) was prepared by precipitation method with ammonium fluoride and barium chloride as raw materials.BaF₂ with purity of more than 99% can be prepared when reaction temperature is 25 ℃,reaction time is 60 min,initial mass fraction of barium chloride is 10%,amount-of-substance ratio of ammonium fluoride to barium chloride is 2.2,and the mass ratio of washing water amount to filter cake amount=10∶1.XRD pattern showed that all the diffraction peaks of barium fluoride sample were consistent with the standard cubic barium fluoride.Therefore it belongs to the cubic crystal system.The technology has short flow route and good economic benefits.

Key words: barium fluoride, ammonium fluoride, barium chloride, direct precipitation method