Question

The number of vacancies present in some metal at 729 Celsius is 1.4E24 m^-3.
calculate the number of vacancies at 472 Celsius given that the energy for vacancy formation is 1.18 eV/atom; assume that the density at both temperature is the same

Answer 1

glven Number of vo concies present in merak (ya? Metal (Ny = 14x1024 m3 Temprature (7,): 729°C -8102K No. of Vocconcies of (12): 42 temperature (12) 472°C.745 Ebenuta custo 811 = (18) un home of Inuoro on eaf éclust utoa too htisuolo owns from equation - Nu = Nexp (- Qui) = NA x I explou la) ar bopn tempropere 7294€ 5472°C. (Nu)2 = N explomo NnXS expole mate) (Nu), = N eap 1 ou 2 NAS L L exp(-0 in) NAYE exp 1. S (density) & mol wli ase game according to Question then mol.wt (Novi)': eople (vs) = (Na), veup sem ) (Nive) - Non & exp (Titel (Nlva) +1.481024 x exp (4943) = 6-1468124 min3 Nug = 6: 146 X1024 m3) tas 745