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Engineering Physics by S. Mani Naidu

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1.2 Cohesive energy and estimation of cohesive energy of ionic solids

Cohesive energy: The amount of energy evolved when a crystalline solid is formed from infinitely separated atoms or the amount of energy required to separate atoms in a crystalline solid to infinite distance is known as cohesive or binding energy of the crystal. The interatomic forces which hold the atoms together in a solid are responsible for crystal formation. So, the energy of the crystal is lower than that of the free atoms by an amount equal to the energy required to pull the atoms to an infinite distance. This energy is called the binding energy of the crystal.

Force between atoms: When atoms are at infinite separation, then there is no interaction between them. As we ...

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