Question:

What type of crystal defect is indicated in the diagram below ? $ { Na^{+} Cl^{-} Na^{+} Cl^{-} Na^{+} Cl^{-}}$ $ {Cl^{-} \Box \, Cl^{-} Na^{+} \Box Na^{+}}$ $ {Na^{+} Cl^{-} \Box Cl^{-} Na^{+} Cl^{-}}$ $ {Cl^{-} Na^{+} Cl^{-} Na^{+} \Box Na^{+}}$

Updated On: Jul 7, 2022
  • Interstitial defect
  • Schottky defect
  • Frenkel defect
  • Frenkel & Schottky defects
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The Correct Option is B

Solution and Explanation

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.
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Notes on The solid state

Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions. 

Solid State

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

  • Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
  • Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.