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Aslandukova A, Aslandukov A, Laniel D, Yin Y, Akbar FI, Bykov M, Fedotenko T, Glazyrin K, Pakhomova A, Garbarino G, Bright EL, Wright J, Hanfland M, Chariton S, Prakapenka V, Dubrovinskaia N, Dubrovinsky L. Diverse high-pressure chemistry in Y-NH 3BH 3 and Y-paraffin oil systems. SCIENCE ADVANCES 2024; 10:eadl5416. [PMID: 38478619 PMCID: PMC10936948 DOI: 10.1126/sciadv.adl5416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 02/09/2024] [Indexed: 03/17/2024]
Abstract
The yttrium-hydrogen system has gained attention because of near-ambient temperature superconductivity reports in yttrium hydrides at high pressures. We conducted a study using synchrotron single-crystal x-ray diffraction (SCXRD) at 87 to 171 GPa, resulting in the discovery of known (two YH3 phases) and five previously unknown yttrium hydrides. These were synthesized in diamond anvil cells by laser heating yttrium with hydrogen-rich precursors-ammonia borane or paraffin oil. The arrangements of yttrium atoms in the crystal structures of new phases were determined on the basis of SCXRD, and the hydrogen content estimations based on empirical relations and ab initio calculations revealed the following compounds: Y3H11, Y2H9, Y4H23, Y13H75, and Y4H25. The study also uncovered a carbide (YC2) and two yttrium allotropes. Complex phase diversity, variable hydrogen content in yttrium hydrides, and their metallic nature, as revealed by ab initio calculations, underline the challenges in identifying superconducting phases and understanding electronic transitions in high-pressure synthesized materials.
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Affiliation(s)
- Alena Aslandukova
- Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
| | - Andrey Aslandukov
- Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Dominique Laniel
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, UK
| | - Yuqing Yin
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - Fariia Iasmin Akbar
- Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
| | - Maxim Bykov
- Institute of Inorganic Chemistry, University of Cologne, Greinstrasse 6, 50939 Cologne, Germany
| | - Timofey Fedotenko
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
| | | | - Anna Pakhomova
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - Gaston Garbarino
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | | | - Jonathan Wright
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - Michael Hanfland
- European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex, France
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637, USA
| | - Vitali Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL 60637, USA
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - Leonid Dubrovinsky
- Bavarian Research Institute of Experimental Geochemistry and Geophysics (BGI), University of Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
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Jaroń T, Ying J, Tkacz M, Grzelak A, Prakapenka VB, Struzhkin VV, Grochala W. Synthesis, Structure, and Electric Conductivity of Higher Hydrides of Ytterbium at High Pressure. Inorg Chem 2022; 61:8694-8702. [PMID: 35642313 PMCID: PMC9490838 DOI: 10.1021/acs.inorgchem.2c00405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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While most of the
rare-earth metals readily form trihydrides, due
to increased stability of the filled 4f electronic shell for Yb(II),
only YbH2.67, formally corresponding to YbII(YbIIIH4)2 (or Yb3H8), remains the highest hydride of ytterbium. Utilizing the
diamond anvil cell methodology and synchrotron powder X-ray diffraction,
we have attempted to push this limit further via hydrogenation
of metallic Yb and Yb3H8. Compression of the
latter has also been investigated in a neutral pressure-transmitting
medium (PTM). While the in situ heating of Yb facilitates
the formation of YbH2+x hydrides, we have
not observed clear qualitative differences between the systems compressed
in H2 and He or Ne PTM. In all of these cases, a sequence
of phase transitions occurred within ca. 13–18
GPa (P3̅1m–I4/m phase) and around 27 GPa (to the I4/mmm phase). The molecular volume of
the systems compressed in H2 PTM is ca. 1.5% larger than of those compressed in inert gases, suggesting
a small hydrogen uptake. Nevertheless, hydrogenation toward YbH3 is incomplete, and polyhydrides do not form up to the highest
pressure studied here (ca. 75 GPa). As pointed out
by electronic transport measurements, the mixed-valence Yb3H8 retains its semiconducting character up to >50 GPa,
although the very low remnant activation energy of conduction (<5
meV) suggests that metallization under further compression should
be achievable. Finally, we provide a theoretical description of a
hypothetical stoichiometric YbH3. Hydrogenation of Yb and Yb3H8 has
been attempted under high pressure (≤75 GPa); the latter compound
has also been investigated in Ne and He. The same sequence of phase
transitions observed in all of these systems, with only minor differences
in molar volume (1.5%), indicates that the limiting composition remains
not far from YbH2.67. The latter retains its semiconducting
character up to >50 GPa, with a very low remnant activation energy
of conduction (<5 meV).
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Affiliation(s)
- Tomasz Jaroń
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland.,Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, United States.,Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-089 Warsaw, Poland
| | - Jianjun Ying
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, United States.,HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439, United States
| | - Marek Tkacz
- Institute for Physical Chemistry, Polish Academy of Science, 01-224 Warsaw, Poland
| | - Adam Grzelak
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
| | - Vitali B Prakapenka
- Consortium for Advanced Radiation Sources, The University of Chicago, Chicago, Illinois 60637, United States
| | - Viktor V Struzhkin
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, District of Columbia 20015, United States.,Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China
| | - Wojciech Grochala
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097 Warsaw, Poland
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Charraud JB, Geneste G, Torrent M, Maillet JB. Machine learning accelerated random structure searching: Application to yttrium superhydrides. J Chem Phys 2022; 156:204102. [DOI: 10.1063/5.0085173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The search for new superhydrides, promising materials for both hydrogen storage and high temperature superconductivity, made great progress, thanks to atomistic simulations and Crystal Structure Prediction (CSP) algorithms. When they are combined with Density Functional Theory (DFT), these methods are highly reliable and often match a great part of the experimental results. However, systems of increasing complexity (number of atoms and chemical species) become rapidly challenging as the number of minima to explore grows exponentially with the number of degrees of freedom in the simulation cell. An efficient sampling strategy preserving a sustainable computational cost then remains to be found. We propose such a strategy based on an active-learning process where machine learning potentials and DFT simulations are jointly used, opening the way to the discovery of complex structures. As a proof of concept, this method is applied to the exploration of tin crystal structures under various pressures. We showed that the α phase, not included in the learning process, is correctly retrieved, despite its singular nature of bonding. Moreover, all the expected phases are correctly predicted under pressure (20 and 100 GPa), suggesting the high transferability of our approach. The method has then been applied to the search of yttrium superhydrides (YH x) crystal structures under pressure. The YH6 structure of space group Im-3m is successfully retrieved. However, the exploration of more complex systems leads to the appearance of a large number of structures. The selection of the relevant ones to be included in the active learning process is performed through the analysis of atomic environments and the clustering algorithm. Finally, a metric involving a distance based on x-ray spectra is introduced, which guides the structural search toward experimentally relevant structures. The global process (active-learning and new selection methods) is finally considered to explore more complex and unknown YH x phases, unreachable by former CSP algorithms. New complex phases are found, demonstrating the ability of our approach to push back the exponential wall of complexity related to CSP.
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Affiliation(s)
| | - G. Geneste
- CEA-DAM, DIF, F-91297 Arpajon Cedex, France
- Université Paris-Saclay, CEA, LMCE, 91680, Bruyères-le-Châtel, France
| | - M. Torrent
- CEA-DAM, DIF, F-91297 Arpajon Cedex, France
- Université Paris-Saclay, CEA, LMCE, 91680, Bruyères-le-Châtel, France
| | - J.-B. Maillet
- CEA-DAM, DIF, F-91297 Arpajon Cedex, France
- Université Paris-Saclay, CEA, LMCE, 91680, Bruyères-le-Châtel, France
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Kong P, Minkov VS, Kuzovnikov MA, Drozdov AP, Besedin SP, Mozaffari S, Balicas L, Balakirev FF, Prakapenka VB, Chariton S, Knyazev DA, Greenberg E, Eremets MI. Superconductivity up to 243 K in the yttrium-hydrogen system under high pressure. Nat Commun 2021; 12:5075. [PMID: 34417471 PMCID: PMC8379216 DOI: 10.1038/s41467-021-25372-2] [Citation(s) in RCA: 61] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 08/04/2021] [Indexed: 02/07/2023] Open
Abstract
The discovery of superconducting H3S with a critical temperature Tc∼200 K opened a door to room temperature superconductivity and stimulated further extensive studies of hydrogen-rich compounds stabilized by high pressure. Here, we report a comprehensive study of the yttrium-hydrogen system with the highest predicted Tcs among binary compounds and discuss the contradictions between different theoretical calculations and experimental data. We synthesized yttrium hydrides with the compositions of YH3, YH4, YH6 and YH9 in a diamond anvil cell and studied their crystal structures, electrical and magnetic transport properties, and isotopic effects. We found superconductivity in the Im-3m YH6 and P63/mmc YH9 phases with maximal Tcs of ∼220 K at 183 GPa and ∼243 K at 201 GPa, respectively. Fm-3m YH10 with the highest predicted Tc > 300 K was not observed in our experiments, and instead, YH9 was found to be the hydrogen-richest yttrium hydride in the studied pressure and temperature range up to record 410 GPa and 2250 K.
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Affiliation(s)
- Panpan Kong
- Max-Planck-Institut für Chemie, Mainz, Germany
| | | | - Mikhail A Kuzovnikov
- Institute of Solid State Physics Russian Academy of Sciences, Chernogolovka, Moscow District, Russia
| | | | | | - Shirin Mozaffari
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | - Luis Balicas
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA
| | | | - Vitali B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
| | - Dmitry A Knyazev
- Max-Planck-Institut für Mikrostrukturphysik, Halle (Saale), Germany
| | - Eran Greenberg
- Center for Advanced Radiation Sources, University of Chicago, Chicago, IL, USA
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Local electronic structure rearrangements and strong anharmonicity in YH 3 under pressures up to 180 GPa. Nat Commun 2021; 12:1765. [PMID: 33741970 PMCID: PMC7979761 DOI: 10.1038/s41467-021-21991-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 02/17/2021] [Indexed: 01/31/2023] Open
Abstract
The discovery of superconductivity above 250 K at high pressure in LaH10 and the prediction of overcoming the room temperature threshold for superconductivity in YH10 urge for a better understanding of hydrogen interaction mechanisms with the heavy atom sublattice in metal hydrides under high pressure at the atomic scale. Here we use locally sensitive X-ray absorption fine structure spectroscopy (XAFS) to get insight into the nature of phase transitions and the rearrangements of local electronic and crystal structure in archetypal metal hydride YH3 under pressure up to 180 GPa. The combination of the experimental methods allowed us to implement a multiscale length study of YH3: XAFS (short-range), Raman scattering (medium-range) and XRD (long-range). XANES data evidence a strong effect of hydrogen on the density of 4d yttrium states that increases with pressure and EXAFS data evidence a strong anharmonicity, manifested as yttrium atom vibrations in a double-well potential.
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