文章基本信息

标题：Direct observation of symmetrization of hydrogen bond in δ-AlOOH under mantle conditions using neutron diffraction
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作者：Asami Sano-Furukawa ; Takanori Hattori ; Kazuki Komatsu 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：15520
DOI：10.1038/s41598-018-33598-2
语种：English
出版社：Springer Nature
摘要：nm to Pnnm at 9.0 GPa, 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 18.1 GPa, which is considerably higher than the disorder pressure. Moreover, there is a significant isotope effect 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.