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| APC | 5022.48 | 17.58 | EUR | 98.05 % | (DEAL) | 810 / 476152 |
| Payment fee | 100.00 | 0.35 | EUR | 1.95 % | (DEAL) | 810 / 476152 |
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| Journal Article | PUBDB-2024-05368 |
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2024
Nature Publishing Group UK
[London]
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Please use a persistent id in citations: doi:10.1038/s41467-024-52505-0 doi:10.3204/PUBDB-2024-05368
Abstract: H2O transforms to two forms of superionic (SI) ice at high pressures and temperatures, which contain highly mobile protons within a solid oxygen sublattice. Yet the stability field of both phases remains debated. Here, we present the results of an ultrafast X-ray heating study utilizing MHz pulse trains produced by the European X-ray Free Electron Laser to create high temperature states of H2O, which were probed using X-ray diffraction during dynamic cooling. We confirm an isostructural transition during heating in the 26-69 GPa range, consistent with the formation of SI-bcc. In contrast to prior work, SI-fcc was observed exclusively above ~50 GPa, despite evidence of melting at lower pressures. The absence of SI-fcc in these runs is attributed to short heating timescales and the pressure-temperature path induced by the pump-probe heating scheme in which H2O was heated above its melting temperature before the observation of quenched crystalline states, based on the earlier theoretical prediction that SI-bcc nucleates more readily from the fluid than SI-fcc. Our results may have implications for the stability of SI phases in ice-rich planets, for example during dynamic freezing, where the preferential crystallization of SI-bcc may result in distinct physical properties across mantle ice layers.
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