Terbium (III, IV) oxide, Wani lokaci ake kira tetraterbium heptaoxide, yana da dabara Tb4O7, ne mai matukar insoluble thermally barga Terbium source.Tb4O7 ne daya daga cikin manyan kasuwanci terbium mahadi, kuma kawai irin wannan samfurin dauke da akalla wasu Tb (IV) (terbium a cikin +4 hadawan abu da iskar shaka). jihar), tare da mafi kwanciyar hankali Tb (III). Ana samar da shi ta hanyar dumama karfen oxalate, kuma ana amfani dashi a cikin shirye-shiryen wasu mahadi na terbium. Terbium ya samar da wasu manyan oxides guda uku: Tb2O3, TbO2, da Tb6O11.