describe the schotty and Frankel defect found in ionic crystals. how these defects affects the properties of the crystals.
Answers
Answer:
Defect
Schottky defect occurs when oppositely charged atoms (cation and anion) leave their corresponding lattice sites and create a pair of Vacancy Defects. Since both cation and anion leave the lattice sites at the same time, so overall electrical neutrality of the crystal is maintained; however, density reduces because of the vacancies. Schottky defects occur in ionic crystals where the size of anion is almost same with the size of the cation.
Frenkel Defect is one type of point defect where an atom (better to say ion, especially cation) leaves its original lattice site and occupies an interstitial position on the same crystal. Usually, this type of defect is observed in ionic solids, where size of anion is substantially larger than the size of cation
Although both Schottky defect and Frenkel defect are point defects and occur only in ionic materials, there exists a big margin between them. Differences between Schottky defect and Frenkel defect are portrayed in the following table.
Explanation:
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