[ U = \frac{N_A M z^+ z^- e^2}{4 \pi \epsilon_0 r_0} \left(1 - \frac{1}{n}\right) ]
[ \frac{n_2}{n_1} = \exp\left[ -\frac{E_f}{k}\left(\frac{1}{T_2} - \frac{1}{T_1}\right) \right] ]
[ U = \frac{N_A M z^+ z^- e^2}{4 \pi \epsilon_0 r_0} \left(1 - \frac{1}{n}\right) ]
[ \frac{n_2}{n_1} = \exp\left[ -\frac{E_f}{k}\left(\frac{1}{T_2} - \frac{1}{T_1}\right) \right] ] fundamentals of ceramics barsoum solutions
