Oral
High Pressure Synthesis of Praseodymium Superhydride | Authors: Nilesh Salke (HPSTAR - Center for High Pressure Science & Technology Advanced Research) ; Ivan Kruglov (MIPT - Department of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, VNIIA - Dukhov Research Institute of Automatics ) ; Dmitrii Semenok (SKOLTECH - Skolkovo Institute of Science and Technology) ; Jianshi Zhou (UT AUSTIN - Department of Mechanical Engineering, The University of Texas at Austin) ; Eran Geenberg (CARS - Center for Advanced Radiation Sources, University of Chicago) ; Vitali Prakapenka (CARS - Center for Advanced Radiation Sources, University of Chicago) ; Jin Liu (HPSTAR - Center for High Pressure Science & Technology Advanced Research) ; Artem Oganov (SKOLTECH - Skolkovo Institute of Science and Technology, MIPT - Department of Problems of Physics and Energetics, Moscow Institute of Physics and Technology, NPU - International Center for Materials Design, Northwestern Polytechnical University) ; Jung-fu Lin (UT AUSTIN - Department of Geological Sciences, The University of Texas at Austin) |
Abstract: Many hydrogen-rich superhydrides (H>6) with interesting superconducting properties were predicted to stabilize at high pressures. Most of these superhydrides stabilize above 150 GPa of pressures. But we were interested to synthesize superhydrides at lowest possible pressure. Here we present the work carried on the praseodymium-hydrogen system to synthesize the new hydrides. Theoretical predictions assisted in our experiments to search for the new hydrogen-rich phases at the lowest possible pressure. We carried the elemental reaction between praseodymium and hydrogen inside the laser heated diamond anvil cell. At high pressures with laser heating, we observed the synthesis of a new phase of praseodymium superhydride. During decompression cycle, the superhydride phase decomposed. Theoretical calculations were carried to understand the structural and dynamical stability of praseodymium superhydride. We also carried the calculations to estimate the superconducting Tc of the praseodymium superhydride phase.
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