I-Terbium(III,IV) Oxide, ngezinye izikhathi ebizwa ngokuthi i-tetraterbium heptaoxide, inefomula ethi Tb4O7, iwumthombo we-Terbium ongancibiliki kakhulu ngokushisa okushisayo.I-Tb4O7 ingenye yezinhlanganisela eziyinhloko ze-terbium, futhi ukuphela komkhiqizo onjalo oqukethe okungenani i-Tb(IV) (i-terbium ku-+4 oxidation). state), kanye ne-Tb(III) ezinzile. Ikhiqizwa ngokushisisa i-oxalate yensimbi, futhi isetshenziselwa ukulungisa ezinye izinhlanganisela ze-terbium. I-Terbium yakha amanye ama-oxide amathathu amakhulu: i-Tb2O3, i-TbO2, ne-Tb6O11.