Chromium Oxide
Overview
Chromium Oxide (Cr₂O₃) is an inorganic compound primarily known for its role as a green pigment and refractory material. In electronics, it is valued for its dielectric properties and stability at high temperatures, making it suitable for semiconductor devices and thin-film applications. Its production involves thermal decomposition of chromium salts or reduction of sodium dichromate. The compound's inertness and resistance to corrosion contribute to its widespread industrial adoption.
Physical and Chemical Properties
Chromium Oxide exhibits exceptional thermal stability, with a melting point of 2435°C and a density of 5.22 g/cm³. Its insoluble nature in water and most solvents makes it ideal for coatings and ceramics. The compound's green color arises from its crystalline structure, which absorbs specific wavelengths of light. Its electrical properties, including high resistivity, are leveraged in electronic components like sputtering targets and resistive layers.
Main Applications
In electronics, Chromium Oxide is used in thin-film resistors, magnetic recording media, and as a dopant in semiconductors. Its refractory properties make it essential for furnace linings and aerospace coatings. The pigment industry relies on Cr₂O₃ for durable green colors in paints, plastics, and inks. It is also employed in metallurgy as a polishing agent and in catalysts for organic synthesis.
Safety and Storage
While Chromium Oxide has low acute toxicity, prolonged exposure to dust may cause respiratory irritation. Use NIOSH-approved masks and ensure proper ventilation during handling. Store in sealed containers away from moisture and reactive substances. Compliance with OSHA and REACH regulations is advised for industrial users.
B2B Procurement Guide
Buyers should prioritize suppliers offering Cr₂O₃ with ≥99% purity and controlled particle size (e.g., 1-10µm for electronic applications). Certificates of Analysis (CoA) and compliance with RoHS/REACH are critical. Bulk purchases (ton-scale) typically reduce costs by 20-30%. Sample testing for color consistency and reactivity is recommended before large orders.
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