Q.

Which of the following is/are true about HCP and CCP lattice?

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a

Number of tetrahedral voids are twice or octahedral holes

b

12 tetrahedral and 6 octahedral voids are present in one HCP unit cell

c

C.N. of HCP unit cell is 12

d

 If atom of tetrahedral voids displace into octahedral voids. then it is Schottky defect.

answer is A, B, C.

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Detailed Solution

For hexagonal closed packed and cubic closed packed lattice;

Number of tetrahedral voids (12) are twice or octahedral holes (6).

Here, 12 tetrahedral and 6 octahedral voids are present in one HCP unit cell

Coordinate number of hexagonal closed packed unit cell is 12.

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