Question

What type of crystal defect is indicated in the diagram below ?
$N{a}^{+}C{l}^{-}N{a}^{+}C{l}^{-}N{a}^{+}C{l}^{-}$
$C{l}^{-}\square C{l}^{-}N{a}^{+}\square N{a}^{+}$
$N{a}^{+}C{l}^{-}\square C{l}^{-}N{a}^{+}C{l}^{-}$
$C{l}^{-}N{a}^{+}C{l}^{-}N{a}^{+}\square N{a}^{+}$

• A. Interstitial defect
• B. Schottky defect
• C. Frenkel defect
• D. Frenkel & Schottky defects

Answer 1

Answer: (B)

Schottky defect is a defect which is produced when one cation and anion are missing from their respective positions leaving behind a pair of holes. The crystal as a whole remains neutral because the number of missing positive ions (cations) and negative ions (anions) is the same.