Q.

In diamond the lattice is fcc with C atoms occupying lattice points as well as some of the voids. Which of the following statements (s) is/are correct about the diamond structure?

IIn the diamond lattice, half of the tetrahedral voids are occupies.
IIPercentage space occupied (packing efficiency) is 74%
IIIIn the diamond lattice, all octahedral voids are occupied

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a

I , II and III

b

Only II

c

Only III

d

Only I

answer is A.

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In diamond the lattice is fcc with C atoms occupying lattice points as well as some of the voids. Which of the following statements (s) is/are correct about the diamond structure?IIn the diamond lattice, half of the tetrahedral voids are occupies.IIPercentage space occupied (packing efficiency) is 74%IIIIn the diamond lattice, all octahedral voids are occupied