Terbium(III) oxide

Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula Tb 2O 3. It is a p-type semiconductor when doped with calcium, and may be prepared by the reduction of Tb 4O 7 in hydrogen at 1300°C for 24 hours.
It is a p-type semiconductor.
It is a basic oxide and easily dissolved to dilute acids, and then almost colourless terbium salt is formed.
Tb2O3 + 6 H+ → 2 Tb3+ + 3 H2O; The crystal structure is cubic and the lattice constant is a = 1057 pm.