Alena Aslandukova, Andrey Aslandukov, Dominique Laniel, Yuqing Yin, Fariia Iasmin Akbar, Maxim Bykov, Timofey Fedotenko, Konstantin Glazyrin, Anna Pakhomova, Gaston Garbarino, Eleanor Lawrence Bright, Jonathan Wright, Michael Hanfland, Stella Chariton, Vitali Prakapenka, Natalia Dubrovinskaia, Leonid Dubrovinsky
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: Y3 H11 , Y2 H9 , Y4 H23 , Y13 H75 , and Y4 H25 ...
March 15, 2024: Science Advances