Which of the following point defects in ionic crystals are classified specifically as stoichiometric defects (where the ratio of cations to anions remains exactly the same as given by the chemical for

Question

Which of the following point defects in ionic crystals are classified specifically as stoichiometric defects (where the ratio of cations to anions remains exactly the same as given by the chemical formula)?

Prashant Kotian · Accepted Answer

Correct answer: A,B. Both Schottky and Frenkel defects do not alter the overall stoichiometry of the compound. In Schottky, ions are lost in their exact formula ratio. In Frenkel, ions simply change positions internally. F-centers and metal deficiency defects are non-stoichiometric as they alter the cation:anion ratio.

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