Gadolinium(III) bromide

Gadolinium(III) bromide is a crystalline compound of gadolinium atoms and three bromine atoms. This salt is hygroscopic.

Preparation
Gadolinium(III) bromide can be obtained by the reaction between gadolinium and hydrobromic acid:
 * $$\mathrm{2 \ Gd + 6 \ HBr \longrightarrow 2 \ GdBr_3 + 3 \ H_2}$$

The anhydrous form can be obtained by heating the hydrate with ammonium bromide.