Hydrogen hydrates under extreme conditions: Insights into high-pressure phases and implications for planetary interiors
Year: 2025
Authors: Andriambariarijaona L., Poreba T., Di Cataldo S., Gaal R., Ranieri U., Santoro M., Hansen T.C., Mezouar M., Tobie G., Bove L.E.
Autors Affiliation: Sapienza Univ Roma, Dipartimento Fis, 4 Piazzale Aldo Moro, I-00185 Rome, Italy; Sorbonne Univ, Inst Mineral Phys Mat & Cosmochim IMPMC, CNRS UMR 7590, MNHN, 4 Pl Jussieu, Paris, France; Ecole Polytech Fed Lausanne, Inst Phys, Lab Quantum Magnetism, CH-1015 Lausanne, Switzerland; Univ Edinburgh, Ctr Sci Extreme Condit, Edinburgh EH9 3FD, Scotland; Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3FD, Scotland; CNR, Ist Nazl Ott, CNR INO, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; European Lab Non Linear Spect, LENS, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Inst Laue Langevin, 71 Ave Martyrs, Grenoble, France; European Synchrotron Radiat Facil, 71 Ave Martyrs, Grenoble, France; Univ Angers, Le Mans Univ, Nantes Univ, CNRS,Lab Planetol & Geosci,UMR 6112, 2 Rue Houssiniere, F-44322 Nantes, France.
Abstract: Hydrogen hydrates, formed from hydrogen and water under high-pressure and low-temperature conditions, exhibit a rich phase behavior governed by intricate intermolecular interactions. Their structural evolution under extreme conditions provides a unique platform to study the interplay between hydrogen bonding, lattice dynamics, and guest-host interactions. This study investigates the complex phase diagram of hydrogen hydrate up to 50 GPa using angle-resolved neutron and x-ray diffraction techniques. We focus on the behavior of key phases: C1, C2, and C3, examining their crystallographic transformations, elastic properties, and pressure-induced structural deformations. Our findings provide critical insights into phase transitions, stability regimes, and the fundamental physics of molecular interactions in dense hydrogen-water systems, enhancing our understanding of their thermodynamic and mechanical properties under extreme conditions. These data are also essential to quantify the role of hydrogen on the thermal state and chemical evolution of water-rich worlds of various sizes.
Journal/Review: PHYSICAL REVIEW B
Volume: 111 (21) Pages from: 214109-1 to: 214109-11
More Information: We acknowledge the Institut Laue-Langevin (ILL) for providing beamtime on D20 (Proposal No. 5-24-560) and the European Synchrotron Radiation Facility for providing beamtime on ID27 (Proposal No. HC-5468) . The authors acknowledge assistance from S. Klotz, C. Payre, and J. Maurice with the high-pressure setup and loading procedure and the support of G. Garbarino with laser heating experiments. We also thank the Synchrotron SOLEIL for the beamtime at BAG for PSICHE beamline (Proposal No. 20230272) and for the support N. Guignot. The authors thank W. Kuhs and D. Wallacher for help in the sample synthesis. S.D.C. acknowledges computational resources from CINECA, Projects No. IsC90-HTS-TECH and No. IsC99-ACME-C, the Vienna Scientific Cluster, Project No. 71754 TEST. L.A., M.S., and L.E.B. acknowledge financial support by the European Union-NextGenerationEU (PRIN N. F2022NRBLPT) . G.T. and L.E.B. acknowledge financial support by the ANR-23-CE30-0034 EXOTIC-ICE. T.P. and L.E.B. acknowledge financial support from the Swiss National Fund (FNS) under Grant No. 212889.KeyWords: Neutron-diffraction; Water; Dependence; Evolution; H2o-h-2DOI: 10.1103/nyqs-t5bz
