Question:

For FCC if AB is just like the rock salt like structure then, A+ and B- are located at -

Updated On: Jul 6, 2022
  • $A^+$ - Tetrahedral voids ; $B^-$ - Corner
  • $A^+$ - Corner and faces ; $B^-$ - Octahedral voids
  • $A^+$ - Octahedral voids ; $B^-$ - Corner and faces
  • $A^+$ - Corner and faces ; $B^-$ - Octahedral and tetrahedral voids
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The Correct Option is C

Solution and Explanation

AB is just like NaCl. Thus twelve $A^+$ are at edges and 1 within body of fcc i.e. in octahedral voids and six $B^-$ at faces and 8 at corner.
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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.