Terbium(III,IV) oxide, occasionally called tetraterbium heptaoxide, has the formula Tb4O7.
T 1261 (OTTO) Terbium oxide, 99.9% Cas 12037-01-3 - used in the preparation of other terbium compounds. Activating agents for fluorescent powders, composites for catalytic automobile exhaust converters, Glass materials with a Faraday Rotation effect for optical and laser-based devices, Magneto-optical glasses, Magneto-optical recording materials.