Question

packing efficiency of each type

Answer 1



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Study Material»IIT JEE Chemistry»Physical Chemistry»Solid State»Packing Efficiency

Packing Efficiency

 

Table of contents

Packing Efficiency

HCP and CCP Structures

Body-Centred Cubic Structures

Simple Cubic Lattice

Factors Affecting Packing Efficiency

Significance of Packing Efficiency


Packing Efficiency

We know that constituent particles (atoms, molecules or ions) are arranged in different patterns in a unit cells. No matter how the particles are arranged in the lattice there is always some vacant space inside which we also call voids. The quantitative aspect of solid state can be done with the help of packing efficiency.



Image 1: Packing efficiency depends on arrangements of atoms and type of packing

Mathematically Packing Efficiency is:



Packing efficiency is defined as the percentage of space occupied by constituent particles packed inside the lattice. It can be calculated with the help of geometry in three structures namely:

HCP and CCP structures

Body-Centred Cubic Structures

Simple Cubic Lattice Structures
 

Factors Affecting Packing Efficiency

Following factors define packing efficiency of unit cell:

Volume of Unit Cell

Number of Atoms in a structure

Volume of atoms