Ionic lattice has two major point defects, (1) Schottky (2) Frenkel defects, Schottky defects occurs due to the cation - anion pairs missing from the lattice sites, Frenkel defects occur when an ion leaves its lattice site and fits into an interstitial space. The neutrality of the crystals is being maintained and we considered all losses from interstitial postions
Structure shown here represents: 

Options

A. Schottky defect
B. Frenkel defect
C. Both defects
D. None of these

Answer

D

Explanation

`{:(+ -+ -+ - + -),(- + - + - + - +),(+ - + - + - + -),(- + - + - + - +),("Neither schottkey nor Frenkel"):}`