Terbium Oxide Formula:Tb4O7;M.Wt:747.72 RE purity:≥99.99% RE impurities:≤100ppm: Gd2O3≤10ppm Dy2O3≤5ppm Ho2O3≤5ppm Er2O3≤5ppm Tm2O3≤5ppm Yb2O3≤7ppm Lu2O3≤5ppm Y2O3≤7ppm TREO:≥99% Non-RE impurities:Fe2O3 ≤ 2ppm SiO2 ≤ 8ppm CaO ≤ 6ppm Cl- ≤100ppm Loss on ignition: ≤ 1% DESCRIPION: Brown powder, insoluble in water, soluble in acids. USES: As an activator for phosphor and a additive in garnet. PACKING: According to the requirements of clients.