In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3^rd of tetrahedral voids.
In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be
(a) X3Y4
(b) X4Y3
(c) X2Y3
(d) X2Y
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(b) : Number of Y atoms per unit cell in ccp lattice
(N) = 4
number of tetrahedral voids = 2N = 2 × 4 = 8
number of tetrahedral voids occupied by X
= 2/3rd of the tetrahedral void = 2/3 × 8 = 16/3
Hence the formula of the compound will be
X16/3 Y4 = X4 Y3
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