77 192.220
Ir
Iridium

Iridium , Ir

Iridium is a chemical element that has the symbol Ir and atomic number 77. A dense, very hard, brittle, silvery-white transition metal of the platinum family, iridium is used in high-strength alloys that can withstand high temperatures and occurs in natural alloys with platinum or osmium. Iridium is notable for being the most corrosion-resistant element known and for its significance in the determination of the probable cause of the extinction, by a meteorite strike, of the dinosaurs. It is used in high-temperature apparatuses, electrical contacts, and as a hardening agent for platinum.

 

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I3-5004-M
Ir Metal 2-5mm Pieces 99.95% PureIridium Metal
I3-10002-P
IrCl3 -8 mesh 99.5% PureIridium Chloride
I3-10003-P
IrO2 -325 mesh (typ. =10 microns)0.999Iridium Oxide
I3-2001-R

Ir Rod 3.18mm diameter 99.95% pure

Iridium

I3-2002-R
Ir Pellets 6mm x 6mm 99.95% PureIridium
I3-2003-R

Ir Rod 12.7mm diameter 99.95% pure

Iridium

I3-2004-R

Ir Rod 15.88mm diameter 99.95% pure

Iridium

I3-2005-R

Ir Rod 19.05mm diameter 99.95% pure

Iridium

I3-2006-R

Ir Rod 25.4mm diameter 99.95% pure

Iridium

IR-SHT-0.5

Ir Sheet Thickness 0.5mm (0.020")

Purity 99.95%, Iridium

IR-SHT-0.76

Ir Sheet Thickness 0.76mm (0.030")

Purity 99.95%, Iridium

IR-SHT-1

Ir Sheet Thickness 1.0mm (0.040")

Purity 99.95%, Iridium

IR-SHT-1.5

Ir Sheet Thickness 1.5mm (0.060")

Purity 99.95%, Iridium

IR-SHT-3.18

Ir Sheet Thickness 3.18mm (0.125")

Purity 99.95%, Iridium

I3-9000-D

Iridium Ir, Purity 99.95%

I3-9001-D

Iridium-Manganese Ir-Mn,

Available in various ratios wt% or at%, Purity 99.9%+

IR-F-0.1

Ir Foil Thickness 0.1mm (0.004") Purity 99.95%

Iridium

IR-F-0.2

Ir Foil Thickness 0.2mm (0.008") Purity 99.95%

Iridium

I3-9000-D24
Ir TRG 57mm dia. x 1mm Tk 99.95% PureIridium
IR-ST-2-3-3N5
Ir TRG 50.8mm dia. x 3mm Tk 99.95% PureIridium

A platinum group metal, iridium is white, resembling platinum, but with a slight yellowish cast. Due to its extreme hardness and brittleness, iridium is difficult to machine, form, or work. It is the most corrosion-resistant metal known: iridium cannot be attacked by any acids or by aqua regia, but it can be attacked by molten salts, such as NaCl and NaCN.

The measured density of iridium is only slightly lower than that of osmium, which is often listed as the densest element known. However, calculations of density from the space lattice may produce more reliable data for these elements than actual measurements and give a density of 22,650 kg/m³ for iridium versus 22,610 kg/m³ for osmium. Definitive selection between the two is therefore not possible at this time.

Symbol Ir
Atomic Number 77
No. of naturally occurring isotopes 2
Atomic weight 192.22(+/-0.03)
Electronic configuration [Xe]4f145d76s2
Effective ionic radius/pm V 57
Effective ionic radius/pm IV 62.5
Effective ionic radius/pm III 68
Effective ionic radius/pm FI -
Electrical resistivity (20°C)/μohm cm 4.71
Density (20°C)/gcm-3 22.61
Melting point /°C 2443
Boiling point/°C 4550(+/-100)
ΔHfus/kJmol-1 26.4
ΔHvap/kJmol-1 612(+/-13)
ΔHf(monoatomic gas/kJmol-1 669(+/-8)
Electronegativity χ 2.2
Ionization energy/kJmol-1 I 880
Ionization energy/kJmol-1 II 1680
Ionization energy/kJmol-1 III 2600
Temperature (oC) @Vap. Pressure
10-8 Torr 1850
10-6 Torr 2080
10-4 Torr 2380
Techniques
Electron Beam Fair
Crucible ThO2
Coil -
Boat -
Remarks
-