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Rhodium, Ruthenium, Iridium and Osmium

by Ben SmyeonAugust 1, 2019

Rhodium is another highly active catalyst used in vehicle emission control systems. With a high melting point and temperature stability, rhodium is used to make glass. While it’s harder and more difficult to work with than other PGMs, rhodium is favoured in alloy applications for its chemical compounds — this also applies to iridium.

As the rarest and most corrosion-resistant of the platinum group metals, iridium is also very dense with a high chemical and thermal stability. Like platinum, iridium’s biological compatibility suits it to many medical applications, which is why both are used in aural and retinal implants. Iridium is also used to make high-purity crystals for medical, petroleum and security applications.

Ruthenium and osmium are hard and brittle, although with poor resistance to oxidation. Nevertheless, both are valued as alloys additives and, like the other PGMs, have superior catalytic properties. Ruthenium is commonly used as an alloying agent for platinum and palladium. It is relied upon in the electrical and electrochemical industries for its conductive properties and durability.

Osmium is the densest and hardest of the group, overall, and is often alloyed with other platinum group metals such as platinum and iridium. It’s also an excellent conductor of electricity and an effective oxidation catalyst. Common uses for osmium include in fuel cells and for forensic science applications.

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