O2− ions are arranged in ccp in a spinel structure. A2+ ions occupy one-eighth of tetrahedral voids and B+ ions occupy half of octahedral voids. The void volume of unit cell is 0.11. Find the value of positive ions A in unit cell.
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Solution
The relationship between the void volume and the unit cell volume (say A) for the given structure is as shown:
Void volume × unit volume of unit cell =O.22
Substitute values in the above expression, 0.11×A=0.22