1
|
Wang ZQ, Gu YJ, Tang J, Yan ZX, Xie Y, Wang YX, Chen XR, Chen QF. Ab initio determination of melting and sound velocity of neon up to the deep interior of the Earth. J Chem Phys 2024; 160:204711. [PMID: 38804489 DOI: 10.1063/5.0200412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Accepted: 05/13/2024] [Indexed: 05/29/2024] Open
Abstract
The thermophysical properties and elemental abundances of the noble gases in terrestrial materials can provide unique insights into the Earth's evolution and mantle dynamics. Here, we perform extensive ab initio molecular dynamics simulations to determine the melting temperature and sound velocity of neon up to 370 GPa and 7500 K to constrain its physical state and storage capacity, together with to reveal its implications for the deep interior of the Earth. It is found that solid neon can exist stably under the lower mantle and inner core conditions, and the abnormal melting of neon is not observed under the entire temperature (T) and pressure (P) region inside the Earth owing to its peculiar electronic structure, which is substantially distinct from other heavier noble gases. An inspection of the reduction for sound velocity along the Earth's geotherm evidences that neon can be used as a light element to account for the low-velocity anomaly and density deficit in the deep Earth. A comparison of the pair distribution functions and mean square displacements of MgSiO3-Ne and Fe-Ne alloys further reveals that MgSiO3 has a larger neon storage capacity than the liquid iron under the deep Earth condition, indicating that the lower mantle may be a natural deep noble gas storage reservoir. Our results provide valuable information for studying the fundamental behavior and phase transition of neon in a higher T-P regime, and further enhance our understanding for the interior structure and evolution processes inside the Earth.
Collapse
Affiliation(s)
- Zhao-Qi Wang
- College of Science, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Yun-Jun Gu
- National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China
| | - Jun Tang
- Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621908, China
| | - Zheng-Xin Yan
- College of Science, Xi'an University of Science and Technology, Xi'an 710054, China
| | - You Xie
- College of Science, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Yi-Xian Wang
- College of Science, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Xiang-Rong Chen
- College of Physics, Sichuan University, Chengdu 610065, China
| | - Qi-Feng Chen
- School of Science, Southwest University of Science and Technology, Mianyang 621010, China
| |
Collapse
|
2
|
Kovačević T, González-Cataldo F, Stewart ST, Militzer B. Miscibility of rock and ice in the interiors of water worlds. Sci Rep 2022; 12:13055. [PMID: 35906271 PMCID: PMC9338078 DOI: 10.1038/s41598-022-16816-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Accepted: 07/15/2022] [Indexed: 11/17/2022] Open
Abstract
Super-Earths and sub-Neptunes are the most common planet types in our galaxy. A subset of these planets is predicted to be water worlds, bodies that are rich in water and poor in hydrogen gas. The interior structures of water worlds have been assumed to consist of water surrounding a rocky mantle and iron core. In small planets, water and rock form distinct layers with limited incorporation of water into silicate phases, but these materials may interact differently during the growth and evolution of water worlds due to greater interior pressures and temperatures. Here, we use density functional molecular dynamics (DFT-MD) simulations to study the miscibility and interactions of enstatite (MgSiO3), a major end-member silicate phase, and water (H2O) at extreme conditions in water world interiors. We explore pressures ranging from 30 to 120 GPa and temperatures from 500 to 8000 K. Our results demonstrate that enstatite and water are miscible in all proportions if the temperature exceeds the melting point of MgSiO3. Furthermore, we performed smoothed particle hydrodynamics simulations to demonstrate that the conditions necessary for rock-water miscibility are reached during giant impacts between water-rich bodies of 0.7–4.7 Earth masses. Our simulations lead to water worlds that include a mixed layer of rock and water.
Collapse
Affiliation(s)
- Tanja Kovačević
- Department of Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA.
| | - Felipe González-Cataldo
- Department of Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA
| | - Sarah T Stewart
- Department of Earth and Planetary Sciences, University of California, Davis, CA, 95616, USA
| | - Burkhard Militzer
- Department of Earth and Planetary Science, University of California, Berkeley, CA, 94720, USA.,Department of Astronomy, University of California, Berkeley, CA, 94720, USA
| |
Collapse
|
3
|
Glazyrin K, Khandarkhaeva S, Fedotenko T, Dong W, Laniel D, Seiboth F, Schropp A, Garrevoet J, Brückner D, Falkenberg G, Kubec A, David C, Wendt M, Wenz S, Dubrovinsky L, Dubrovinskaia N, Liermann HP. Sub-micrometer focusing setup for high-pressure crystallography at the Extreme Conditions beamline at PETRA III. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:654-663. [PMID: 35510998 PMCID: PMC9070721 DOI: 10.1107/s1600577522002582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
Scientific tasks aimed at decoding and characterizing complex systems and processes at high pressures set new challenges for modern X-ray diffraction instrumentation in terms of X-ray flux, focal spot size and sample positioning. Presented here are new developments at the Extreme Conditions beamline (P02.2, PETRA III, DESY, Germany) that enable considerable improvements in data collection at very high pressures and small scattering volumes. In particular, the focusing of the X-ray beam to the sub-micrometer level is described, and control of the aberrations of the focusing compound refractive lenses is made possible with the implementation of a correcting phase plate. This device provides a significant enhancement of the signal-to-noise ratio by conditioning the beam shape profile at the focal spot. A new sample alignment system with a small sphere of confusion enables single-crystal data collection from grains of micrometer to sub-micrometer dimensions subjected to pressures as high as 200 GPa. The combination of the technical development of the optical path and the sample alignment system contributes to research and gives benefits on various levels, including rapid and accurate diffraction mapping of samples with sub-micrometer resolution at multimegabar pressures.
Collapse
Affiliation(s)
- K. Glazyrin
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - S. Khandarkhaeva
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - T. Fedotenko
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - W. Dong
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - D. Laniel
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - F. Seiboth
- Center for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - A. Schropp
- Center for X-ray and Nano Science CXNS, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
- Helmholtz Imaging Platform, Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - J. Garrevoet
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - D. Brückner
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
- Department Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
- Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
| | - G. Falkenberg
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - A. Kubec
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen-PSI, Switzerland
| | - C. David
- Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Forschungsstrasse 111, 5232 Villigen-PSI, Switzerland
| | - M. Wendt
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - S. Wenz
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| | - L. Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
| | - N. Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Campus Valla, Fysikhuset F310, SE-581 83 Linköping, Sweden
| | - H.-P. Liermann
- Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg, Germany
| |
Collapse
|