Scandium Oxide[2]
Overview
Scandium Oxide (Sc2O3) is a high-purity rare earth compound derived from scandium, a lightweight transition metal. It is primarily produced through the calcination of scandium salts or as a byproduct of uranium extraction. Due to scandium's scarcity, the oxide is a premium material with niche industrial applications. As a refractory ceramic, it exhibits exceptional thermal and chemical stability, making it valuable in extreme environments. Its optical properties, including transparency in the infrared spectrum, further expand its utility in specialized technologies.
Physical and Chemical Properties
Scandium Oxide is characterized by its high melting point (2480°C) and density (3.86 g/cm³), ranking it among the most thermally stable rare earth oxides. It crystallizes in a cubic structure (bixbyite type), contributing to its mechanical strength. Chemically, it is amphoteric, reacting with both acids and bases. While insoluble in water, it dissolves in hot concentrated acids like HCl or H2SO4. Its refractive index (≈1.9) and broad optical transmission range (0.3-6 μm) make it suitable for optical coatings.
Main Applications
In electronics, Scandium Oxide is critical for manufacturing scandium-doped aluminum nitride (AlScN) thin films used in 5G RF filters and MEMS devices. The compound also serves as a host material for europium-doped high-intensity discharge lamps, producing daylight-mimicking illumination. The aerospace sector utilizes Sc2O3-stabilized zirconia ceramics for thermal barrier coatings. Emerging applications include solid oxide fuel cells (SOFCs) and neutron absorption materials in nuclear reactors due to scandium's high thermal neutron capture cross-section.
Safety and Storage
While Scandium Oxide has low acute toxicity, prolonged exposure to fine powder may cause respiratory irritation. NIOSH recommends using N95 respirators and chemical goggles when handling bulk quantities. Spills should be contained with inert absorbents. Storage requires moisture-proof packaging, typically double-bagged in polyethylene with desiccants. For long-term preservation, maintain temperatures below 30°C with relative humidity under 60%. Incompatible materials include strong acids and halogens.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification for rare earth processing. Key specifications include purity grade (standard 99.9%, high-end 99.99%-99.999%), particle size distribution (typically 1-10μm), and trace metal analysis. Due to supply chain volatility, consider contractual agreements with price adjustment clauses. Audit suppliers for ethical mining practices, as scandium often originates from red mud processing. Sample testing for phase purity via XRD is recommended before bulk purchases.
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