Dysprosium(III) selenide

Dysprosium(III) selenide is one of the selenides of dysprosium, with the chemical formula of Dy2Se3.

Preparation
Dysprosium(III) selenide can be prepared by reacting dysprosium(III) oxide or dysprosium(III) chloride with hydrogen selenide:


 * Dy2O3 + 3 H2Se -> Dy2Se3 + 3 H2O
 * 2 DyCl3 + 3 H2Se -> Dy2Se3 + 6 HCl

It can also be obtained by reacting the elements at high temperatures:


 * 2 Dy + 3 Se -> Dy2Se3

Properties
Dysprosium(III) selenide reacts with arsenic triselenide to obtain DyAsSe3.


 * Dy2Se3 + As2Se3 -> 2DyAsSe3