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Properties of Diamond

Chemical Composition Carbon
Crystal Structure Cubic Fd3m - O7h
Atomic Weight 12.01
Atomic Radius 0.077 nm
Number of Atoms in Unit Cell 8
Number of Atoms per cubic meter 1.77 x 1029
Density (3.1524 + 0.00005) x 10-3 kgm-3
Graphitization ~900 K
Chemical Activity Very inert. Attacked only by oxidizing agents and carbide formers.
Hardness 10 Moh
Indentation Hardness Depending on Crystallograpic Direction, 5700 - 10400 kg/m2
Coefficient of Friction in Air 0.1 But depends on load direction and geometry
Youngs Modulus 10.54 x 1011 Nm-2
Specific Heat 6.195 Jg-1
Refractive Index 2.4
Dielectric Constant 5.70 + 0.05 at 300 K
Resistivity >1018 Ohm m
 
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