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