Find out the ratio of the mole-fraction of the Frenkel’s defect in NaCl crystal at 4000K temperature. The amount of energy needed to form Frenkel’s defects and Schottky defects are respectively 2 eV and 4 eV.Given that $1ev = 1.6 \times 10^{–19}V$ and $k = 1.23 \times 10^{–23}$

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