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High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen content

Title data

Laniel, Dominique ; Trybel, Florian ; Winkler, Björn ; Knoop, Florian ; Fedotenko, Timofey ; Khandarkhaeva, Saiana ; Aslandukova, Alena ; Meier, Thomas ; Chariton, Stella ; Glazyrin, Konstantin ; Milman, Victor ; Prakapenka, Vitali ; Abrikosov, Igor A. ; Dubrovinsky, Leonid ; Dubrovinskaia, Natalia:
High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen content.
In: Nature Communications. Vol. 13 (16 November 2022) Issue 1 . - No. 6987.
ISSN 2041-1723
DOI: https://doi.org/10.1038/s41467-022-34755-y

Abstract in another language

The lanthanum-hydrogen system has attracted significant attention following the report of superconductivity in LaH10 at near-ambient temperatures and high pressures. Phases other than LaH10 are suspected to be synthesized based on both powder X-ray diffraction and resistivity data, although they have not yet been identified. Here, we present the results of our single-crystal X-ray diffraction studies on this system, supported by density functional theory calculations, which reveal an unexpected chemical and structural diversity of lanthanum hydrides synthesized in the range of 50 to 180 GPa. Seven lanthanum hydrides were produced, LaH3, LaH~4, LaH4+δ, La4H23, LaH6+δ, LaH9+δ, and LaH10+δ, and the atomic coordinates of lanthanum in their structures determined. The regularities in rare-earth element hydrides unveiled here provide clues to guide the search for other synthesizable hydrides and candidate high-temperature superconductors. The hydrogen content variability in lanthanum hydrides and the samples’ phase heterogeneity underline the challenges related to assessing potentially superconducting phases and the nature of electronic transitions in high-pressure hydrides.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professor Materials Physics and Technology at Extreme Conditions
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professor Materials Physics and Technology at Extreme Conditions > Professor Materials Physics and Technology at Extreme Conditions - Univ.-Prof. Dr. Natalia Doubrovinckaia
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 22 Nov 2022 08:13
Last Modified: 22 Nov 2022 08:13
URI: https://eref.uni-bayreuth.de/id/eprint/72853