Question

The number of tetrahedral and octahedral void per unit cell of cubic closed packed structure is

• A. 44659
• B. 44655
• C. 44777
• D. 44781

Answer 1

Answer: (C)

44777

Answer 2

In ccp or fee structure Number of lattice points
$(Z)=4$
$\because$ Number of octahedral voids = Number of lattice points
$\therefore$ Number of octahedral voids $=4$
and Number of tetrahedral voids $=2 \times$
Number of octahedral voids
$\therefore$ number of tetrahedral voids $=2 \times 4=8$