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Ronan Asked :

17-06-2021 Solid

Q. When a pair of cation and anion are missing in a crystal, it is called ____________

A. Vacancy defect
B. Line imperfection
C. Schottky defect
D. Frenkel defect

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Dapzoi Verified
Commented on 2021-06-17 16:27:01 (IST)
Answer: C

Explanation: Schottky’s defect, named after its discoverer Walter H. Schottky, forms when two atoms of opposite charge (anion and cation) leaves their regular atomic positions thus creating two vacancies. As two atoms of opposite charges are leaving, there is no change in overall charge of the material with Schottky’s defect. Schottky’s defect is known for its presence in ionic crystals.