How is Terbium oxide (CAS: 12037-01-3) typically synthesized?

Terbium oxide can be synthesized through the thermal decomposition of terbium(III) nitrate [Tb(NO3)3] or by the reduction of terbium(III) oxide with hydrogen gas. Commonly, the solid-state reaction is used where terbium nitrate is heated in an oxygen atmosphere to form the oxide. The reaction is typically carried out at high temperatures, and the purity and homogeneity of the product can be controlled by adjusting the reaction conditions.