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Schottky defect is a type of point defect observed in ionic crystals. This defect arises when a cation and an anion (that is, two oppositely charged ions) are missing from their respective lattice sites. It is named after the German physicist Walter H. Schottky, who described this phenomenon in 1935. In a Schottky defect, the missing ions always occur as a cation-anion pair to maintain electrical neutrality, ensuring that the overall charge of the crystal remains neutral. Formation and Propertie