The kinetics of H diffusivity in synthesized polycrystalline material was measured using infra-red spectroscopy. The samples had the composition, (Mg0.89Fe0.11)2SiO4. The hydration experiments were conducted at 15 to 16GPa and 900 to 1200C. The temperature dependence of H diffusion was:

D(cm2/s) = 9.6 x 10-6exp[-123(kJ/mol)/RT]

at 15GPa.

R.Hae, E.Ohtani, T.Kubo, T.Koyama, H.Utada: Earth and Planetary Science Letters, 2006, 243[1-2], 141-8