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Compare the space available in the two types of voids formed in the solids.

Asked by Topperlearning User 16th June 2016, 3:36 PM
Answered by Expert

The stacking of two close packed anion layers produces 2 types of voids or holes.  One set of holes are octahedrally coordinated by 6 anions, the second set are tetrahedrally coordinated by 4 anions.  Six particles form the octahedral void 4 in one plane and one above and one below. If the radius of the bigger ion which is generally the anion is R and of the smaller ion r then the radius ratio = 0.414. Similarly for a perfect fit of a cation into the tetrahedral sites it can be shown that rcation/ranion = 0.225.

Answered by Expert 16th June 2016, 5:36 PM
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