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Gadolinium(III) fluoride

Gadolinium(III) fluoride is an inorganic compound with a chemical formula GdF<sub>3</sub>.

Preparation

Gadolinium(III) fluoride can be prepared by heating gadolinium oxide and ammonium bifluoride. The reaction involves two steps:

Gd<sub>2</sub>O<sub>3</sub> + 6 NH<sub>4</sub>HF<sub>2</sub> → 2 NH<sub>4</sub>GdF<sub>4</sub> + 4 NH<sub>4</sub>F + 3 H<sub>2</sub>O
NH<sub>4</sub>GdF<sub>4</sub> → GdF<sub>3</sub> + NH<sub>3</sub> + HF

Alternatively, reacting gadolinium chloride with hydrofluoric acid and adding hot water produces GdF<sub>3</sub>·xH<sub>2</sub>O (x=0.53). Anhydrous gadolinium(III) fluoride can then be produced by heating the hydrate with ammonium bifluoride; without the bifluoride, GdOF is formed instead.

GdCl<sub>3</sub> + 3 HF + x H<sub>2</sub>O → GdF<sub>3</sub>·xH<sub>2</sub>O + 3 HCl

Uses

Gadolinium(III) fluoride is used to produce fluoride glasses.

References