Thulium oxide is white powder with slightly green color, which turns into red with lustre after heating and it turns into yellowish white again if longer heating. It is rare earth oxide. It is insoluble in water, but dissolve in strong acid slowly. Tm3O3 absorb CO2 and H2O in air to form subcarbonate salts.
|Molecular Formula: Tm2O3
Thulium(III) oxide mainly applies to make portable X-ray transmission device. It acts as control material in reactor.
Thulium trioxide is raw material for X-ray luminescent materials, garnet laser material, rare earth glass laser material and magnetic bubble.