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Iridium(IV) oxide, IrO 2, is the only well-characterised oxide of iridium. It is a blue-black solid. It is a blue-black solid. The compound adopts the TiO 2 rutile structure , featuring six coordinate iridium and three coordinate oxygen.
Another oxide, iridium tetroxide, is also known, with iridium in the +8 oxiation state. [7] This compound was formed by photochemical rearrangement of [(η 1-O 2)IrO 2] in solid argon at a temperature of 6 K (−267.15 °C; −448.87 °F). At higher temperatures, the oxide is unstable. [8] The detection of the iridium tetroxide cation IrO +
Iridium pentafluoride is also a strong oxidant, but it is a tetramer, Ir 4 F 20, formed by four corner-sharing octahedra. ... [22] and obtained a volatile new oxide, ...
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Refractory metals have high melting points, with tungsten and rhenium the highest of all elements, and the other's melting points only exceeded by osmium and iridium, and the sublimation of carbon. These high melting points define most of their applications. All the metals are body-centered cubic except rhenium which is hexagonal close-packed.
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Iridium oxide is a stable bulk WOC catalyst with low overpotential. [ 16 ] Ni-based oxide film liberates oxygen in quasi-neutral conditions at an overpotential of ~425 mV and shows long lasting stability. [ 17 ]
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