An element (atomic weight = 50) crystallises in an fcc lattice, with a = 0.50 nm. The density of the unit cell (in gm/cc) if it contains 0.25% Schottky defects is
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Solution
Density of a crystal decreases due to Schottky defects, effective number of atoms per unit cell in the given lattice =
4 (1−0.25/100) = 3.99 ρ=50×3.996×1023×(0.5×10−7)3=50×3.996×125×0.1=2.66