Strong hydrogen bonding in a dense hydrous magnesium silicate discovered by neutron Laue diffraction.

ABSTRACT: A large amount of hydrogen circulates inside the Earth, which affects the long-term evolution of the planet. The majority of this hydrogen is stored in deep Earth within the crystal structures of dense minerals that are thermodynamically stable at high pressures and temperatures. To understand the reason for their stability under such extreme conditions, the chemical bonding geometry and cation exchange mechanism for including hydrogen were analyzed in a representative structure of such minerals (i.e. phase E of dense hydrous magnesium silicate) by using time-of-flight single-crystal neutron Laue diffraction. Phase E has a layered structure belonging to the space group R 3 m and a very large hydrogen capacity (up to 18% H2O weight fraction). It is stable at pressures of 13-18 GPa and tempe

SUBMITTER: Purevjav N 

PROVIDER: S-EPMC7201286 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature