High-pressure synthesis of dysprosium carbides

Titelangaben

Akbar, Fariia Iasmin ; Aslandukova, Alena ; Aslandukov, Andrii ; Yin, Yuqing ; Trybel, Florian ; Khandarkhaeva, Saiana ; Fedotenko, Timofey ; Laniel, Dominique ; Bykov, Maxim ; Bykova, Elena ; Dubrovinskaia, Natalia ; Dubrovinsky, Leonid:
High-pressure synthesis of dysprosium carbides.
In: Frontiers in Chemistry. Bd. 11 (2023) . - 1210081.
ISSN 2296-2646
DOI der Verlagsversion: https://doi.org/10.3389/fchem.2023.1210081

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Abstract

Chemical reactions between dysprosium and carbon were studied in laser-heated diamond anvil cells at pressures of 19, 55, and 58 GPa and temperatures of ∼2500 K. In situ single-crystal synchrotron X-ray diffraction analysis of the reaction products revealed the formation of novel dysprosium carbides, Dy₄C₃ and Dy₃C₂, and dysprosium sesquicarbide Dy₂C₃ previously known only at ambient conditions. The structure of Dy₄C₃ was found to be closely related to that of dysprosium sesquicarbide Dy₂C₃ with the Pu₂C₃-type structure. Ab initio calculations reproduce well crystal structures of all synthesized phases and predict their compressional behavior in agreement with our experimental data. Our work gives evidence that high-pressure synthesis conditions enrich the chemistry of rare earth metal carbides.