 
 Example 6.1
 Equilibrium concentration of vacancies of aluminium at 0K is 0
 Equilibrium concentration of vacancies of aluminium at 300K is 1.44e-12
 Equilibrium concentration of vacancies of aluminium at 900K is 1.13e-04

 Equilibrium concentration of vacancies of Nickel at 0K is 0
 Equilibrium concentration of vacancies of Nickel at 300K is 5.59e-30
 Equilibrium concentration of vacancies of Nickel at 900K is 1.77e-10 