Erbium(III) selenate

Erbium(III) selenate is an inorganic compound, with the chemical formula Er2(SeO4)3. It exists as an anhydrate or an octahydrate.

Preparation and properties
Monoclinic erbium(III) selenate octahydrate can be crystallized from the solution when dissolving erbium oxide in selenic acid:


 * Er2O3 + 3 H2SeO4 + 5 H2O → Er2(SeO4)3·8H2O

Erbium(III) 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 K3Er(SeO4)3·nH2O and NH4Er(SeO4)2·3H2O, etc.