R3: High-pressure science and deep Earth's material

[R3P-05] high pressure hydrous phase e-AlOOH

*Masayuki Nishi¹, Yasuhiro Kuwayama², Jun Tsuchiya¹ (1. Ehime Univ., GRC, 2. Tokyo Univ., Sci.)

Keywords:hydrous phase

Based on in-situ X-ray diffraction experiments in a laser-heated diamond anvil cell as well as first principles calculations, we found that d-AlOOH transforms into a new phase with orthorhombic symmetry, named e-AlOOH, at e-190 GPa. Some hydrous phases remain stable beyond pressures found in the Earth’s core-mantle boundary and hydrogen may thus be stored in these hydroxides or their potential high-pressure forms in the deep interiors of terrestrial super-Earths, and the rocky cores of some ice giants.