![]() ![]() It has Low-toxicity, But Iridium-192 is dangerous like other radioactive isotopes, even it can increase the risk of cancer, because of high energy gamma radiation. It is also used in pivot bearings, in scientific & other special equipment. Nowadays demand for iridium comes mainly from the automotive industry, electronic industry, and chemical industry, where it is used to coat the electrodes in the chlor-alkali process (It is used to produce chlorine and sodium hydroxide (lye/caustic soda)), and in catalyst. Iridium alloys are used in making the standard meter bar (contains 90% platinum & 10% iridium), to make crucibles, and also used for the contacts in spark plugs because of its low reactivity & high melting point. Iridium is the most corrosion-resistant material, where it is used in special alloys & forms an alloy with osmium, which is used for fountain pen tips & compass bearing. It is not reacts with acids, including aqua regia: Iridium Historyĭiscovery & first isolation: Smithson Tennant (1803) in London, England Iridium Uses Ir (s) + 3 F 2 (g) → IrF 6 (s) (Ir (VI) fluoride)ĭirectly reacts with halogens under anhydrous (dry) conditions, and forms Iridium (III) halides:Ģ Ir (s) + 3 F 2 (g) → 2 IrF 3 (s) (Iridium (III) Fluoride)Ģ Ir (s) + 3 Cl 2 (g) → 2 IrCl 3 (s) (Iridium (III) Chlorine)Ģ Ir (s) + 3 Br 2 (g) → 2 IrBr 3 (s) (Iridium (III) Bromide)Ģ Ir (s) + 3 I 2 (g) → 2 IrI 3 (s) (Iridium (III) Iodide) Reacts with fluorine, and forms highly corrosive Iridium (VI) fluoride, and also forms Iridium (V) fluoride (IrF 5) 4 when heated, which has the yellow tetrameric structure. It doesn’t react with water under normal condition. Ir (s) + O 2 (g) → IrO 2 (s) (Iridium (VI) oxide) The metal reacts with oxygen, when heated: Space Group Number: 225 Face Centered Cubic (FCC) Reactivity of IridiumĮlectron affinity: 2.2 kJ/mol Nuclear Properties of Iridium Ionization energies: 1st: 544 kJ.mol 2nd: 1070 kJ/mol 3rd: 2260 kJ/mol Sound Speed: 4825 m/s Atomic Properties of Iridium Molar magnetic susceptibility: 0.321×10 -9 m 3/mol Physical Properties of Iridiumĭensity: 22.56 g/cm 3 (In solid) 19 g/cm 3 (In Liquid at M.P) Mass magnetic susceptibility: 1.67×10 -9 m 3/kg Volume magnetic susceptibility: 0.0000377 Magnetic susceptibility (x mol): +25.6×10 -6 cm 3/mol Thermal conductivity: 147 W/(m∙K) Electrical properties of IridiumĬritical point (Superconducting point): 0.11 K (-273.04 oC, -459.47 oF) Magnetic Properties of Iridium World’s Top 3 Reserve holders of IridiumĮlectrons per shell: K2, L8, M18, N32, O15, P2Įlectron configuration: 1s 22s 22p 63s 23p 63d 104s 24p 64d 105s 25p 64f 145d 76s 2 Irdium Electron Configuration Thermal Properties of Iridiumĭebye temperature: 430 K (156.85 oC, 314.33 oF).
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