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How does a Schottky defect form in an ionic crystal?
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crystal
A crystal form of elemental sulfur. Sulfur has an atomic weight of about 32.06 atomic mass units (amu), which means that its molar mass is 32.06 grams.
A Schottky defect is a type of point defect in a crystalline solid where the lattice structure is disrupted by the absence of ions.1
In an ionic crystal, this defect forms when two ions of opposite charge leave their normal lattice sites and move to the surface of the crystal. By relocating these ions to the exterior, the crystal maintains its overall electrical neutrality while creating vacancies within the internal lattice structure. This process is distinct from other imperfections, such as the Frenkel defect, where an ion is merely displaced to an interstitial space within the lattice rather than migrating to the surface.213