76 190.230

Os

Osmium

Osmium , Os

Osmium is a chemical element that has the symbol Os and atomic number 76. Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family, and is one of the densest natural elements, competing for this status with iridium. Osmium is used in alloys with platinum, iridium and other platinum group metals. Osmium is found in nature as an alloy in platinum ore. Alloys of osmium are employed in fountain pen tips, electrical contacts and in other applications where extreme durability and hardness are needed.

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Evaporation Materials

Sputtering Targetscustom requests

Sputtering Targets25.4 - 101.6mm dia.

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O1-5000-M

Os 3-6mm Pieces 99.9% PureOsmium

O1-9000-D

Osmium Os,

Purity 99.95%

O1-9001-D

Osmium-Ruthenium Os-Ru,

Available in various ratios wt% or at%, Purity 99.95%

OS-ST-2-3-4N

Os TRG 50.8mm dia. x 3mm Tk 99.99% PureDensity >90%Osmium

Symbol Os

Atomic number 76

No. of naturally occurring isotopes 7

Atomic weight 190.2

Electronic configuration [Xe]4f^J45d⁶6s²

Metal radius(12-coordinate)/pm 135

Ionic radius(4-coordinate)/pm VIII 39

Ionic radius(6-coordinate)/pm VII 52.5

Ionic radius(6-coordinate)/pm VI 54.5

Ionic radius(6-coordinate)/pm V 57.5

Ionic radius(6-coordinate)/pm IV 63

Density (20°C)/gcm^-3 22.57

Melting point / °C 3045(+/-30)

Boiling point / °C 5025(+/-100)

ΔH_fus/kJmol^-1 31.7

ΔH_vap/kJmol^-1 738

ΔH_{f(monoatomic gas)}/kJmol^-1 791 (+/-13)

Electrical resistivity

(20°C)/μohm cm 8.12

Electronegativity χ 2.2

Ionization energy/kJmol^-1 I 840

Ionization energy/kJmol^-1 II 1600

Ionization energy/kJmol^-1 III 2400