Iridium is used in tips of ballpoint pens.Used in high-dose-radiation therapy for the treatment of prostate and other forms of cancer.Iridium is commonly used in complexes like Ir(mppy) 3 and other complexes in polymer LED technology to increase the efficiency from 25% to almost 100% due to triplet harvesting.Osmium/iridium alloys are used for compass bearings.Electrical contacts (notable example: Pt/Ir sparkplugs).For making crucibles and devices that require high temperatures.The principal use of iridium is as a hardening agent in platinum alloys. Definitive selection between the two is therefore not possible at this time. However, calculations of density from the space lattice may produce more reliable data for these elements than actual measurements and give a density of 22650 kg/m³ for iridium versus 22610 kg/m³ for osmium. The measured density of this element is only slightly lower than that of osmium, which is often listed as the most dense element known. Iridium cannot be attacked by any acids or by aqua regia, but it can be attacked by molten salts, such as NaCl and NaCN. Iridium is the most corrosion-resistant metal known. Due to its extreme hardness and brittle properties, iridium is difficult to machine, form, or work. It is used in high temperature apparatus, electrical contacts, and as a hardening agent for platinum.Ī platinum group metal, iridium is white, resembling platinum, but with a slight yellowish cast. Iridium is notable for being the most corrosion resistant element known and for its significance in the determination of the probable cause of the demise, by a meteorite strike, of the dinosaurs. A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium. Iridium ( IPA: /ɪˈɹɪdiəm/) is a chemical element in the periodic table that has the symbol Ir and atomic number 77.
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