Hydrogen transport in lithium hydride as a function of temperature

The exchange process for the reaction between deuterium gas and lithium hydride single crystals has been studied as a function of temperature over the range 400–550°C at 380 torr. The rate of the exchange process was assumed to be diffusion controlled; thus the kinetic data were analyzed by fitting to solutions of Fick's law. A one‐dimensional model yields an activation energy range of $\text{22.7 ± 2.8\hspace{0.17em}}\mathrm{kcal}$ for the diffusion of deuteride ion. A three‐dimensional model gives the activation energy range as $\text{24.3 ± 3.0\hspace{0.17em}}\mathrm{kcal}$ .