Question

3.9 The accompanying graph shows the self-diffusion coefficient for Na+ in an NaCl crystal doped with CdCl. NaCl is believed to form Schottky defects. Using the data in the graph, calculate the following. (a) The activation energy for self-diffusion of Na+ in NaCl. (b) The enthalpy of formation of Schottky defects in NaCl (in eV). 10-8 TIT 3 x 10-96 10-94 → 10-10 - - - - 3 x 10-11 Diffusion coefficient (cm2/s) 10-11 10-12 5x 10-13 11.23 10-13LLLLLL 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1/T 103 1.7