Question

In which of the following pairs of structures are tetrahedral void as well as octahedral void

Answer 1

The question seems to be incomplete as the options have not been given. So, I am giving a general answer based on a similar question from another website.

The correct answer is - HCP and CCP.

HCP stands for Hexagonal Close-Packed Crystal Structure. CCP stands for cubic closed packed structure.

Both CCP and HCP are considered to be Face-Centred Cubic (FCC) structures that have closely packed particles. These structures have a high value of the packing efficiency when compared with the other crystal structures like the Body Centered Cubic (BCC) and other simple cubic structures.

The HCP and the CCP crystal structures have two types of voids. They are called as the tetrahedral and as the octahedral voids. These two voids are identical in these structures since the voids will form in between the 2 layers of atoms.