Iridium(IV) oxide

Iridium

• Black, odorless solid ( pure substance)
• Blue-black solid ( Diydrat )

• 224.22 g · mol -1
• 260.25 g · mol -1 ( dihydrate)

Fixed

11.7 g · cm -3

Is at 1200 ° C in about Iridiumtrioxid

Insoluble in water

Risk

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Iridium ( IV) oxide or iridium dioxide is a chemical compound and an oxide of iridium, which passes at 1200 ° C in Iridiumtrioxid. The pure substance is a black solid, the hydrate a blue-black solid.

Production and representation

Iridium dioxide produced during the combustion of iridium. Since Iridium is extremely inert, high temperatures and pure oxygen are necessary for this.

It can also be obtained by oxidation of iridium ( III) chloride with oxygen at 600 ° C.

Properties

Physical Properties

Iridium (IV ) oxide crystallizes in the tetragonal crystal system with space group P42/mnm and the lattice parameters a = 449.83 pm and c = 354.4 pm, in the unit cell contains two formula units. The structure thus corresponds to the rutile structure.

Chemical Properties

Upon heating of iridium dioxide at 1200 ° C, Iridiumtrioxid that only in the gas phase, however, is stable and is not recoverable as solid forms.

Use

Iridium dioxide is used for coating electrochromic materials or metallic electrodes in the medical technology for improving the corrosion resistance and biological compatibility.