The animation shows a Schottky defect in NaCl. Schottky defects are point defects that occur when a pair of ions leave the structure. This maintains the overall charge but also results in a reduction in density of the solid. Consequently there is a relaxtion of the ions around the vacant site and slight increase in volume.
Schottky defects can lead to ionic conduction in solids. View the mechanism of conduction.
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