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Types of Unit Cell

In a closed p...

Question

In a closed pack structure of mixed oxides,the lattice is composed of mixed oxide ion .One eighth of tetrahedral voids are occupied by divalent caption A+2 while one half of octahedral void are occupied by trivalent captions B+3 .The formula of mixed oxide is?

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Solution

Actually the bigger molecules like oxygen occupy the lattice points.In ccp unit cell the effective number of atoms occupying lattice points is 8(1/8)+6(1/2)=4 and in ccp the number of tetrahedral voids is 8 so divalents ions will be 8/8 and number of octahedral voids are 4 so one half would be 2 finally,AB2O4.

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