Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments
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 tr...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Nature Research
2024
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| _version_ | 1811141341341548544 |
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| author | Husband, RJ Liermann, HP McHardy, JD McWilliams, RS Goncharov, AF Prakapenka, VB Edmund, E Chariton, S Konôpková, Z Strohm, C Sanchez-Valle, C Frost, M Andriambariarijaona, L Appel, K Baehtz, C Ball, OB Briggs, R Buchen, J Cerantola, V Choi, J Coleman, AL Cynn, H Dwivedi, A Graafsma, H Koemets, E Marquardt, H |
| author_facet | Husband, RJ Liermann, HP McHardy, JD McWilliams, RS Goncharov, AF Prakapenka, VB Edmund, E Chariton, S Konôpková, Z Strohm, C Sanchez-Valle, C Frost, M Andriambariarijaona, L Appel, K Baehtz, C Ball, OB Briggs, R Buchen, J Cerantola, V Choi, J Coleman, AL Cynn, H Dwivedi, A Graafsma, H Koemets, E Marquardt, H |
| author_sort | Husband, RJ |
| collection | OXFORD |
| description | 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 lower pressure 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. |
| first_indexed | 2024-09-25T04:36:20Z |
| format | Journal article |
| id | oxford-uuid:99f6cda3-67d8-40c0-80df-2680596a2749 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:36:20Z |
| publishDate | 2024 |
| publisher | Nature Research |
| record_format | dspace |
| spelling | oxford-uuid:99f6cda3-67d8-40c0-80df-2680596a27492024-09-23T20:11:23ZPhase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experimentsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:99f6cda3-67d8-40c0-80df-2680596a2749EnglishJisc Publications RouterNature Research2024Husband, RJLiermann, HPMcHardy, JDMcWilliams, RSGoncharov, AFPrakapenka, VBEdmund, EChariton, SKonôpková, ZStrohm, CSanchez-Valle, CFrost, MAndriambariarijaona, LAppel, KBaehtz, CBall, OBBriggs, RBuchen, JCerantola, VChoi, JColeman, ALCynn, HDwivedi, AGraafsma, HKoemets, EMarquardt, HH2O 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 lower pressure 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. |
| spellingShingle | Husband, RJ Liermann, HP McHardy, JD McWilliams, RS Goncharov, AF Prakapenka, VB Edmund, E Chariton, S Konôpková, Z Strohm, C Sanchez-Valle, C Frost, M Andriambariarijaona, L Appel, K Baehtz, C Ball, OB Briggs, R Buchen, J Cerantola, V Choi, J Coleman, AL Cynn, H Dwivedi, A Graafsma, H Koemets, E Marquardt, H Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title | Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title_full | Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title_fullStr | Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title_full_unstemmed | Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title_short | Phase transition kinetics of superionic H 2 O ice phases revealed by Megahertz X-ray free-electron laser-heating experiments |
| title_sort | phase transition kinetics of superionic h 2 o ice phases revealed by megahertz x ray free electron laser heating experiments |
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