Thulium(III) selenide

Thulium(III) selenide is an inorganic compound with the chemical formula Tm2Se3.

Preparation
Thulium(III) selenide can be obtained by the reaction of thulium and selenium:


 * 2 Tm + 3 Se -> Tm2Se3

It can also be prepared by reacting thulium oxide and hydrogen selenide at high temperature:


 * Tm2O3 + 3 H2Se -> Tm2Se3 + 3 H2O

Thulium(III) selenide is also generated in the thermal decomposition of (py)3Tm(SePh)3.

Preparation
In the binary system of thulium(III) selenide and antimony triselenide, TmSb3Se6, Tm6Sb8Se21, TmSbSe3 and Tm8Sb2Se15 can be formed.