Solid StateMedium
Question
A mineral having the formula AB2 crystallizes in the ccp lattice, with A atoms occupying the lattice points. Select the correct statements (s).
Options
A.The coordination number (CN) for A atoms = 8.
B.The CN for B atoms = 4
C.100% of TVs are occupied by B atoms
D.50% of TVs are occupied by B atoms.
Solution
Number of atoms = 4 (for ccp crystal)
Formula = 4AB2 = A4B8
∴ CN of A = 8 [CN of A = Number of B atoms]
CN of B = 4 [CN of B = Number of A atoms]
In ccp arrangement, all TVs are occupied (fluorite-type structure).
Formula = 4AB2 = A4B8
∴ CN of A = 8 [CN of A = Number of B atoms]
CN of B = 4 [CN of B = Number of A atoms]
In ccp arrangement, all TVs are occupied (fluorite-type structure).
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