Yttrium sulfate octahydrate

Yttrium sulfate octahydrate (CAS 7446-33-5) is the crystalline, hydrated sulfate salt of yttrium with the molecular formula Y₂(SO₄)₃·8H₂O; a white to pale-yellow crystalline powder, specific gravity about 2.56 g/cm³, readily soluble in water.

Where is Yttrium sulfate octahydrate used?

• Catalysis: yttrium-ion precursor for mixed-oxide and supported catalysts
• Phosphor and electronics manufacturing: precursor to yttrium oxide and yttrium-doped oxide phosphors for display backlighting and solid-state lighting
• Rare earth separation trains: intermediate via controlled sulfate precipitation to isolate high-purity yttrium streams
• Glass and structural ceramics: yttrium source for stabilised zirconia and specialty optical glass
• Its controlled solubility and well-defined stoichiometry suit aqueous impregnation and co-precipitation workflows.

Good to know: The anhydrous form (CAS 13510-71-9) is a related grade for moisture-sensitive syntheses; confirm the hydration state when selecting material.

Commercial specifications

• Purity expressed on a rare earth oxide basis per standard trade convention
• Grades 2N to 5N (99 %–99.999 % Y₂O₃/TREO); TREO quoted alongside yttrium oxide assay
• Catalyst and separation work: 3N to 4N (≥ 99.9 % Y₂O₃/TREO); research and phosphor precursors: 4N or 5N
• Crystalline powder in 100 g research lots up to 25 kg industrial packs