On the interactions of potassium bromide with alkali fluorides

The interactions of alkali fluorides (LiF, NaF, KF, CsF) with potassium bromide (KBr) by milling and by crystallization from water solutions have been studied by X-ray diffraction and IR techniques. KBr reacts with CsF according to CsF+KBr→KF+CsBr. With LiF and NaF, KBr does not react. With KF, KBr forms a very hygroscopic solid in which KF partially dissolves in the water of hydration and also forms the crystalline phase KF·2H2O.