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First-principles study of hydrogen bond symmetrization of phase D under high pressure

¹ Department of Chemical Engineering and Materials Science, University of Minnesota, Minnesota 55455, U.S.A.
² Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan
³ Department of Physics, University of Tokyo, Tokyo 113-0033, Japan

Correspondence: ^* E-mail: junt{at}cems.umn.edu

We have investigated the physical and structural properties of phase D (MgSi₂O₆H₂) at high pressure by means of a first-principles calculation method. Phase D is important as a dense hydrous magnesium silicate with high stability under pressure, and as one of the most likely candidates for a water reservoir in the Earth’s lower mantle. The calculated compression behavior of phase D is in very good agreement with experimental results. We found a distinct but continuous change from asymmetric to symmetric hydrogen bonding in phase D at 40 GPa. This pressure-induced hydrogen bond symmetrization has a significant effect on the compression behavior of phase D. The bulk modulus increases by about 20% with this structural change. This behavior of pressure-induced hydrogen bond symmetrization is very similar to that previously reported by us for -AlOOH. The transition is reversible and second-order, and thus the high-pressure state is probably unquenchable.

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