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Cohesive Energy of Diamond
The cohesive energy of a solid is defined as the energy required for separating the condensed material into isolated free atoms. Cohesive energies range from about 0.1 eV or 10 kJ/mol for inert gases up to about 8 eV or 800 kJ/mol per atom for strongly bound materials such as diamond or tungsten.
The calculation of the cohesive energy requires a value of the total energy for the solid and of the free atoms. The energy difference between atoms and a solid is a measure of the bonding strength in the solid material. This appears to be a straightforward task. In practice, however, there are a number of subtleties, which are illustrated here for the case of a seemingly simple system, namely diamond.
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