Question

3) Compare the concentration of positive ion vacancies in a NaCl crystal due to the presence of 10^(-4) mol fraction of CaCl2 impurity with the concentration you would expect in pure NaCl crystal at 400C. The formation energy ( delta hs) of a vacancy pair in pure NaCl is 2.12 ev, and the mole fractions of such defects at the melting point (800°C) is 2.8X10^(-4).

Answer 1

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