Diverse high-pressure chemistry in Y-NH₃BH₃ and Y–paraffin oil systems

Title data

Aslandukova, Alena ; Aslandukov, Andrii ; Laniel, Dominique ; Yin, Yuqing ; Akbar, Fariia Iasmin ; Bykov, Maxim ; Fedotenko, Timofey ; Glazyrin, Konstantin ; Pakhomova, Anna ; Garbarino, Gaston ; Bright, Eleanor Lawrence ; Wright, Jonathan ; Hanfland, Michael ; Chariton, Stella ; Prakapenka, Vitali ; Dubrovinskaia, Natalia ; Dubrovinsky, Leonid:
Diverse high-pressure chemistry in Y-NH₃BH₃ and Y–paraffin oil systems.
In: Science Advances. Vol. 10 (2024) Issue 11 . - eadl5416.
ISSN 2375-2548
DOI: https://doi.org/10.1126/sciadv.adl5416

Official URL:

Abstract in another language

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. Single-crystal XRD supported by theoretical calculations reveals the formation of seven yttrium hydrides at high pressures.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. Single-crystal XRD supported by theoretical calculations reveals the formation of seven yttrium hydrides at high pressures.

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:	18 Mar 2024 10:13
Last Modified:	18 Mar 2024 10:13
URI:	https://eref.uni-bayreuth.de/id/eprint/88892