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in a compound, XY2O4, oxide ions are arranged in ccp. cations X are present in the octahedral voids and y is equally distributed between octahedral and tetrahedral voids. what is the fraction of octahedral voids occupied?
Hi Pooja,
No of atoms in ccp is 4 and in this ques these are oxide ions. So there will be 8 tetrahedral voids and 4 octahedral voids per unit cell. In a unit cell 1 x and 1 Y occupy octahedral voids. so 2 out of 4 octa. voids are occupied : implies 50% or 1/2 is the fraction of octahedral voids occupied.
Hope that helps.
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