Article | REF: J6630 V2

Rare earths

Authors: Valérie BUISSETTE, Thierry LE MERCIER

Publication date: May 10, 2019

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3. Different rare earth chemistries

Rare earths can be used in the form of salts, solids, metals and organic complexes.

3.1 Salts

The salts used industrially are nitrates and chlorides of trivalent rare earths, which can be derived directly from separation processes. They come in the form of dried crystals or aqueous solutions at a few moles per liter. In the latter case, the solutions exhibit a slight free acidity (HCl or HNO 3 ). The color of trivalent rare earth salts is related to their 4f-4f transitions: Nd(NO 3 ) 3 mauve, Pr(NO 3 ) 3 green, Dy(NO ...

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Different rare earth chemistries
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