Question
Sat April 05, 2014 By: Amanj Jaiswal

sir explain why tetrahedral  voids are twice than octahedral voids?

Expert Reply
Mon April 07, 2014

If one layer of spheres is kept on a second layer in a cubic closed packed arrangement, then the arrangement is as shown in figure 1 (for tetrahedral hole) giving an arrangement that is twice as shown in figure 2 (for octahedral hole). Therefore, the tetrahedral holes are in double number than the octahedral holes.

If octahedral voids are ‘n’, then the tetrahedral voids are ‘2n’.

Figure 1                                 Figure 2

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