AUTHOR=Akbar Fariia Iasmin , Aslandukova Alena , Aslandukov Andrey , Yin Yuqing , Trybel Florian , Khandarkhaeva Saiana , Fedotenko Timofey , Laniel Dominique , Bykov Maxim , Bykova Elena , Dubrovinskaia Natalia , Dubrovinsky Leonid 

TITLE=High-pressure synthesis of dysprosium carbides

JOURNAL=Frontiers in Chemistry

VOLUME=11

YEAR=2023

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2023.1210081

DOI=10.3389/fchem.2023.1210081

ISSN=2296-2646

ABSTRACT=<p>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. <italic>In situ</italic> single-crystal synchrotron X-ray diffraction analysis of the reaction products revealed the formation of novel dysprosium carbides, Dy<sub>4</sub>C<sub>3</sub> and Dy<sub>3</sub>C<sub>2</sub>, and dysprosium sesquicarbide Dy<sub>2</sub>C<sub>3</sub> previously known only at ambient conditions. The structure of Dy<sub>4</sub>C<sub>3</sub> was found to be closely related to that of dysprosium sesquicarbide Dy<sub>2</sub>C<sub>3</sub> with the Pu<sub>2</sub>C<sub>3</sub>-type structure. <italic>Ab initio</italic> 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.</p>