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

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Number of tetrahedral voids are twice or octahedral holes

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

C.N. of HCP unit cell is 12

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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