Overview
Iridium is a rare transition metal belonging to the platinum group metals (PGMs). It was discovered in 1803 and is known for its exceptional density and resistance to corrosion. Despite its scarcity, iridium plays a critical role in specialized industrial applications due to its unique properties. As the most corrosion-resistant metal, iridium remains unaffected by acids, including aqua regia, except under specific conditions. Its high melting point and hardness make it valuable in extreme environments, such as aerospace and high-temperature equipment.
Physical and Chemical Properties
Iridium is characterized by its silvery-white appearance and remarkable density, ranking among the densest elements. It has a face-centered cubic crystal structure, contributing to its brittleness at room temperature. Chemically, iridium is highly inert, resisting oxidation even at elevated temperatures. It forms stable compounds primarily in the +3 and +4 oxidation states. Its insolubility in most acids, except aqua regia, underscores its chemical stability, making it ideal for corrosive environments.
Main Applications
Iridium's primary use is in catalysts, particularly in the production of acetic acid and other fine chemicals. Its resistance to corrosion and high temperatures makes it indispensable in spark plugs for aviation and high-performance engines. In electronics, iridium coatings protect critical components from wear and oxidation. The metal is also used in medical devices, such as radiotherapy equipment, and in crucibles for growing single crystals due to its inertness.
Safety and Storage
While iridium is generally non-toxic, its powdered form can pose inhalation risks, requiring proper ventilation and protective equipment. Storage should avoid contact with strong oxidizers to prevent unintended reactions. Bulk iridium is stable under ambient conditions but should be kept in sealed containers to minimize dust generation. Disposal must follow local regulations for heavy metals to prevent environmental contamination.
B2B Procurement Guide
Procuring iridium requires attention to purity levels, typically 99.9% or higher for industrial use. Buyers should prioritize suppliers with certifications (e.g., ISO) and traceable sourcing to ensure ethical and quality standards. Prices fluctuate based on market demand and geopolitical factors, so long-term contracts may stabilize costs. Consider form factors (e.g., pellets, wire) tailored to your application to minimize processing waste.
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