A binary solid (A+B−) has a zinc blende structure with B− ions constituting the lattice and A+ ions occupying 25% tetrahedral holes. The formula of solid is:
So, there are 4 B− ions. And A+ occupy 25% of the tetrahedral voids. There are 8 tetrahedral voids so 25% of 8 voids is 2. Therefore, the formula of the binary solid is A2B4 or AB2.
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Answer:
So, there are 4 B− ions. And A+ occupy 25% of the tetrahedral voids. There are 8 tetrahedral voids so 25% of 8 voids is 2. Therefore, the formula of the binary solid is A2B4 or AB2.