Terbium(III) oxide

Terbium(III) oxide, also known as terbium sesquioxide, is a sesquioxide of the rare earth metal terbium, having chemical formula . It is a p-type semiconductor when doped with calcium, and may be prepared by the reduction of in hydrogen at 1300 °C for 24 hours.
Tb4O7+H2->2 Tb2O3+H2O
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.
The crystal structure is cubic and the lattice constant is "a" = 1057 pm.