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E 6125 (OTTO) Europium(III) nitrate, pentahydrate, 99.9% Cas 63026-01-7 - used as a dopant. E 6125 (OTTO) Europium(III) nitrate, pentahydrate, 99.9% Cas 63026-01-7 - used to prepare Gd2O3-doped Eu (5 mol%) films.