Imperfections In Solids

Concept: Crystal defects are imperfections in the arrangement of ions in a crystal lattice. Two common ionic defects are:
• Schottky defect: Equal number of cations and anions are missing from the lattice.
• Frenkel defect: A cation leaves its lattice site and occupies an interstitial position.

Step 1: Identify the structure of . is an ionic crystal where and ions have comparable sizes.

Step 2: Determine the defect type. In such crystals, vacancies of both ions occur to maintain electrical neutrality. This type of defect is called the Schottky defect.