Erbium(III) selenate

Erbium selenate is an inorganic compound, with the chemical formula Er₂₃. It exists as an anhydrate or an octahydrate.

Preparation and properties

Monoclinic erbium selenate octahydrate can be crystallized from the solution when dissolving erbium oxide in selenic acid:
Erbium selenate octahydrate is first dehydrated by heating to obtain the anhydrous form, and then heated continuously to obtain erbium selenite and finally erbium(III) oxide.
It can crystallize with M₂SeO₄ in aqueous solution to form double salts, such as K₃Er₃·nH₂O and NH₄Er₂·3H₂O, etc.