The concentration of Schottky defects in a crystal with a density of is ;
The concentration of Schottky defects can be calculated using the formula:where
is the number of Schottky defects and
is the total number of lattice sites.
The density of the crystal can be calculated using the formula:
, where m is the mass of one unit cell and
is the volume of one unit cell.
The number of lattice sites can be calculated using the formula:
Substituting the value of in the formula for
, we get:
Rearranging the above equation, we get:
Substituting the given values, we get:
Therefore, the concentration of Schottky defects is