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//Number of Vacancies Computation at a Specified temperature
clear;
clc;
printf("\tExample 4.1\n");
Na=6.023*10^23; //Avogadro No.
den=8.4D+06; //Density of Copper
A=63.5; //Atomic weight of Copper
//No. of atomic site per cubic meter
N=Na*den/A;
//No. of vacancies at 1000 C
Qv=0.9; //Activation energy in eV
k=8.62*10^-5; //Boltzmann Constatnt in eV/K
T=1000+273; //Temperature in K
Nv=N*exp(-Qv/(k*T));
printf("\nNo.of vacancies are %.1f * 10^25 /m^3",Nv/10^25);
//End
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