Title: Direct observation of symmetrization of hydrogen bond in δ-AlOOH under mantle conditions using neutron diffraction

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [3];  [4]; ORCiD logo [5];  [5];  [5]
  1. Japan Aerospace Exploration Agency, Ibaraki (Japan). J-PARC Center; DOE/OSTI
  2. Japan Aerospace Exploration Agency, Ibaraki (Japan). J-PARC Center
  3. Univ. of Tokyo (Japan). Graduate School of Science. Geochemical Research Center
  4. Hakkaido Univ., Sappro (Japan). Faculty of Science. Dept. of Earth and Planetary Sciences
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

At ambient pressure, the hydrogen bond in materials such as ice, hydrates, and hydrous minerals that compose the Earth and icy planets generally takes an asymmetric O-H···O confguration. Pressure signifcantly afects this confguration, and it is predicted to become symmetric, such that the hydrogen is centered between the two oxygen atoms at high pressure. Changes of physical properties of minerals relevant to this symmetrization have been found; however, the atomic confguration around this symmetrization has remained elusive so far. Here we observed the pressure response of the hydrogen bonds in the aluminous hydrous minerals δ-AlOOH and δ-AlOOD by means of a neutron difraction experiment. We fnd that the transition from P21nm to Pnnm at 9.0GPa, accompanied by a change in the axial ratios of δ-AlOOH, corresponds to the disorder of hydrogen bond between two equivalent sites across the center of the O···O line. Symmetrization of the hydrogen bond is observed at 18.1GPa, which is considerably higher than the disorder pressure. Moreover, there is a signifcant isotope efect on hydrogen bond geometry and transition pressure. This study indicates that disorder of the hydrogen bond as a precursor of symmetrization may also play an important role in determining the physical properties of minerals such as bulk modulus and seismic wave velocities in the Earth’s mantle.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1624430
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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