Equilibrium Population of Self-Interstitials in a Monatomic Crystal

2 EQUILIBRIUM POPULATION OF SELF-INTERSTITIALS IN A MONATOMIC CRYSTAL 

Because the configurational entropy of interstitial defects has the same form as that of vacancies, a population of self-interstitial atoms is also thermodynamically stable. The creation of these defects can then also be treated as a pseudochemical equilibrium, and an equation for the relationship between the number of self-interstitials and the appropriate equilibrium constant for interstitial generation, Kv is readily 

3In the literature, the calculations are almost always expressed in units of electron volt (eV), where 1 eV is equivalent to 96.485 kJ moF1 or 1.60218 x 10 19J. 

In the case where the number of normal and interstitial sites is the same, that is, N=Ni. 

The Gibbs energy, AGi, is often split into two terms and the entropy term neglected, as in the previous section, to give 

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