Diamond Physical Properties
Property Diamond’s value Comments
Chemical reactivity Extremely low
Hardness (kg/mm2) 9000 CBN: 4500 SiC: 4000
Thermal conductivity (W/cm-K) 20 Ag: 4.3 Cu: 4.0
Tensile strength (pascals) 3.5 x 109 (natural) 1011 (theoretical)
Compressive strength (pascals) 1011 (natural) 5 x 1011 (theoretical)
Band gap (ev) 5.5 Si: 1.1 GaAs: 1.4
Resistivity (W-cm) 1016 (natural)
Thermal Expansion Coeff (K-1) 0.8 x 10-6 SiO2: 0.5 x 10-6
Refractive index 2.41 @ 590 nm Glass: 1.4 - 1.8
Coeff. of Friction 0.05 (dry) Teflon: 0.05