PROPERTIES OF IRIDIUM METAL

SR. NO. PROPERTY VALUE
1 Lattice constant a at 25°C, nm 0.38394
2 Density at 25°C, g/cm3 22.560
3 Melting point 2443°C (4429°F)
4 Boiling point 4500°C (8130°F)
5 Specific heat at 0°C, cal/g 0.0307
6 Thermal conductivity 0–100°C, cal cm/cm2 s °C 0.35
7 Linear coefficient of thermal expansion 20–100°C, μin./in./°C 6.8
8 Electrical resistivity at 0°C, microhm-cm 4.71
9 Temperature coefficient of electrical resistance 0–100°C/°C 0.00427
10 Tensile strength (1000 lb/in.2)
a. Soft 160 – 180
b. Hard 300 - 360
11 Young's modulus at 20°C
a lb/in.2, static 75.0 × 106
b lb/in.2, dynamic 76.5 × 106
12 Hardness, diamond pyramid number
a Soft 200 – 240
b Hard 600 – 700
13 ΔHfusion, kJ/mol 26.4
14 ΔHvaporization, kJ/mol 612
15 ΔHf monoatomic gas, kJ/mol 669
16 Electronegativity 2.2
17 Purity 99.999

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