Calculation of Number of Atoms#!#Close Packing

Close Packing In 3d

Calculation Of The Contribution Of Atoms Present At Different Lattice Sites|Calculation Of Number Of Atoms|Close Packed Structures|Close Packing in Two Dimensions|Close Packing in Three Dimensions|Summary

Calculation Numbers Of Atoms In Unit Cell|Close Packed Structures|Summary

Calculation Numbers Of Atoms In Unit Cell|Summary|Close Packed Structures

Close Packing|Summary

Assertion . Hexagonal close packing is equally closely packed than cubic close packing . Reason. Hexagonal close packing has a corrdination number of 12 whereas cubic close packing has a coordination number of 8.

The difference in coordination numbers of hexagonal close packing in 3D and square close packing in 2-D, of identical spheres is:

Three-dimensional close packing in solids is referred to as stacking the second square closed packing exactly above the first. In this tight packing, the spheres are horizontally and vertically correctly balanced. Similarly, we can obtain a simple cubic lattice by adding more layers, one above the other. This can be done in two ways. Three-dimensional close packing from two-dimensional square close-packed layers: By putting the second square closed packing exactly above the first, it is possible to form three-dimensional close packing. In this tight packing, the spheres are horizontally and vertically correctly balanced. Similarly, we can obtain a simple cubic lattice by adding more layers, one above the other.Three-dimensional close packing from two-dimensional hexagonal close-packed layers: With the assistance, of two-dimensional hexagonal packed layers, three-dimensional close packing can be obtained. The coordination number of cubic closed packing is:

Calculate the value of (Z)/(10). Where z = co-ordination number of 2D-square close packing + Co-ordination number of 2D-hcp + Co-ordination number of 3D-square close packing + Co-ordination number of 3D, ABCABC........packing + Co-ordiantional number of 3D, ABAB.......packing .