The rhodium is a chemical element, of symbol Rh and Atomic number 45. With the Ruthenium, the palladium, the Osmium, the Iridium, and the Platine it forms the Groupe of platinum.

The name derives from the Greek word “rhodon” which means “pink”. This name was proposed by its discoverer because of the color pink-red of composed of the rhodium.
William Hyde Wollaston discovered this element, just as palladium, in 1803 in platinum gross originating in South America.

Uses

• Catalyst for gasoline cars: often contain a rhodium and platinum alloy on a ceramics support (80% of the total production).
• electrical Contacts: out of metal covered with a very thin layer of rhodium.
• Tubes with x-rays: on the anti Cathode S (still called Anode S) of certain tubes with X-rays used in Spectrometry of x-ray fluorescence.
• Mirror: tie profit of its excellent Reverberation and its large Hardness, one applies it to the mirrors of the projectors.
• Used in brilliant-dark and hard layer for articles of silverware and parts of cameras (before the era of numerical).

More generally Catalyst in chemical industry and heater for very high temperatures (it melts with 2237°K).

See too

• Metals of the group of platinum

External bonds

August 1st

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