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Question

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are :

A
12,6
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B
8,4
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C
6,12
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D
2,1
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Solution

The correct option is A 12,6
  • Number of octahedral and tetrahedral voids formed by N closed packed atoms are N and 2N respectively.
  • Each hexagonal unit cell contains 6 atoms therefore, number of tetrahedral and octahedral voids are 12 and 6 respectively.
Hexagonal Unit cell:

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