Journal
APPLIED PHYSICS LETTERS
Volume 114, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5096989
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- University of New Mexico
- National Science Foundation (NSF) [EAR 1646527]
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We presented the experimentally determined single-crystal elasticity model of ice up to 103(3) GPa, based on the sound velocity measurements of high-P ice polymorphs within multiple diamond anvil cells using Brillouin spectroscopy. We have not observed any discontinuities of the P-wave (Vp) or S-wave (Vs) velocities over the entire P range. The elastic moduli of high-P ice show a close to linear P dependence. In comparison with the high-P silicate minerals in terrestrial planetary bodies, the Vp and Vs values of ice exceed those of both bridgmanite and ferropericlase at P>80-90GPa, counter-intuitively indicating that the high-P ice, if existing in the deep terrestrial planets' interior, is not a slow phase. Instead, the high-P ice shows extremely strong elastic anisotropy, reaching 27% and 74% at 100GPa for Vp and Vs, respectively. The presence of high-P ice in terrestrial planets' interior, even on a small scale may lead to the observable anisotropic signatures, such as the 25% Vs anisotropy in the deep earthquake-generating zone in subducting slabs. We anticipate our measurements to serve as an important base for explaining and modeling the geophysical observations for various types of planetary bodies.
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