S2: Water Rock Interaction (Special Session)

[S2P-04] Analysis of dehydration processes in atomic scale of hydrous minerals by neutron scattering and transmission electron microscopy

*Takuo Okuchi¹, Narangoo Purevjav¹, Yusuke Seto², Naotaka Tomioka³, Kaoru Shibata⁴, Takeshi Yamada⁵ (1. Okayama Univ. IPM, 2. Kobe Univ., 3. JAMSTEC, 4. JAEA, 5. CROSS)

Keywords:Neutron scattering, Transmission electron microscopy, Hydrous minerals, dehydration reactoin

Hydrous minerals have been playing fundamental roles in the evolution of the Earth. Atomic-scale transport process of hydrogen within the relevant crystal structures when dehydration occurs within these minerals (e.g. by volume diffusion or grain-boundary diffusion ?, and by transport of H⁺, hydrogen vacancy, or H₂O ? etc.) were left unknown. We analyze these processes by means of neutron scattering and transmission electron microscopy. Here we report results on brucite, DHMS phase E, and few other hydrous minerals at temperatures to around 600 K.