An investigation was made of hydrogen diffusivity in crystalline quartz by computing the diffusion coefficient for 700 to 1500K and by characterizing the diffusion path and mechanism. The main findings were that hydrogen diffusion was anisotropically confined along the c-axis in α- and β-quartz, that hydrogen diffused via a jump-like mechanism and that the temperature-dependent diffusivity obeyed an Arrhenius law, with activation energies of 0.56 and 0.27eV for α- and β-quartz, respectively.

Hydrogen Diffusion in Quartz: a Molecular Dynamics Investigation. Bongiorno, A., Colombo, L.: Materials Research Society Symposium - Proceedings, 1996, 408, 515-20