The Solid State

Short Answer Type

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What is possible formula of a compound which is made of two elements P and Q and forms fcc structure. Atoms P occupy corner positions and Q occupy face positions of cube?

In a fcc unit cell, there are 8 corners and 6 faces. Eight corners contribute 8 x 1/8 = 1 atom
six faces contribute 6 x 1/2 = 3 atoms.
So the formula of the compound is PQ3.
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