Properties of metal iridium

Physical properties: Iridium is a platinum group metal, hard and brittle, with a very high melting point, which is difficult to cast and plastic. Iridium is the only metal that still maintains excellent mechanical properties in the air above 1600℃, and its boiling point is extremely high, ranking 10 among all elements. Iridium will show superconductor characteristics below 0. 14 K, and the density of iridium ranks second among all elements. The density of iridium is 22.562 0.011g/+0g/? .

Chemical properties: Iridium is one of the most corrosive metals: it can resist almost all acids, aqua regia, molten metals and even silicates at high temperatures. However, some molten salts, such as sodium cyanide and potassium cyanide, as well as oxygen and halogen (especially fluorine) can still corrode iridium at high temperature.

Extended data:

Iridium is one of the rarest elements in the earth's crust, with an average mass ratio of only 0.0438+0 per million. The abundance of gold is 40 times, that of platinum is 10 times, and that of silver and mercury is 80 times. In contrast, the content of iridium in meteorites is much higher, generally above 0.5 parts per million.

Iridium exists in the form of pure metal or alloy in nature, especially iridium osmium alloys in various proportions. There are three geological structures in the crust: igneous rocks with the highest iridium content, impact craters and geological structures evolved from the former two. Iridium also exists in secondary deposits and combines with platinum and other platinum-based elements in alluvial deposits.

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