Face centered cubic lattice of NaCl may also smaller, tetragonal unit cell as shown below fig. (a,b) The volume of the smaller unit cell in fig(a) , if the volume normal unit cell is V, is

Face centered cubic lattice of NaCl may also smaller, tetragonal unit

1.	Face centered cubic lattice of NaCl may also smaller, tetragonal unit cell as shown below fig. (a,b) The volume of the smaller unit cell in fig(a) , if the volume normal unit cell is V, is
Answer» V V/2 2V V/4 Solution :B,Unit CELL (a): the slating unit cell length is `(l)/sqrt(2)`, where l=length of fcc unit cell. Unit cell (b): the angle between the two edges on the front face (HEAVIER lines) is `90^(@)` . This unit cell extends only `(l)/(2)` towards back, there fore the VOLUME of unit cell `(l)/sqrt(2)XX(l)/sqrt(2)xx(l)/sqrt(2)=(l^(3))/(4)=(v)/(4)`