Crystal defects in silver chloride

The two most common point defects in crystals are Frenkel defects and Schottky defects. What are these  

In Schottky defects, equal numbers of cations and anions are missing (for 1 1 structures such as AgCl). In Frenkel defects, an ion is displaced from its lattice site to an interstitial site for example, a small cation in a crystal with the NaCl structure can move to a tetrahedral hole from the octahedral hole normally 

We can use molecular mechanics to estimate the energies of these defects in silver halides. 

The dominant defect in silver halides is a Frenkel defect, in which a silver ion moves to an interstitial site. To calculate the energy required to form this defect we simply remove a silver ion from one position, put it in its new position and compare the energy of the crystal lattice with that of the perfect lattice. 

In a Frenkel defect, there is a vacancy where an ion should be and an ion in a more crowded interstitial position. Would you expect the ions in the vicinity of the defect to stay on their lattice positions  

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