A Schottky defect is a type of point defect that occurs in ionic crystals. It involves the simultaneous vacancy of an anion and a cation in the crystal lattice, maintaining the overall charge neutrality of the material. Essentially, a Schottky defect is characterized by the absence of one positive ion (cation) and one negative ion (anion) from their respective lattice sites. This defect can influence the properties of the material, such as its density, ionic conductivity, and electrical properties.
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