TY - JOUR A1 - Bykov, M. A1 - Yusenko, Kirill A1 - Bykova, E. A1 - Pakhomova, A. A1 - Kraus, Werner A1 - Dubrovinskaia, N. A1 - Dubrovinsky, L. T1 - Synthesis of arsenopyrite-type rhodium pernitride RhN2 from a single-source azide precursor JF - European Journal of Inorganic Chemistry N2 - Nitrogen-rich noble metal nitrides possess unique mechanical and catalytic properties, therefore their synthesis and characterization is of interest for fundamental solid state chemistry and materials science. In this study we have synthesized a singlesource precursor [Rh(NH3)6]3(N3)5Cl4 (Rh:N ratio 1:11). Its controlled decomposition in a laser-heated diamond anvil cell at 39 GPa resulted in a formation of rhodium pernitride, RhN2. According to the results of single-crystal X-ray diffraction RhN2 has arsenopyrite structure type crystal structure previously unknown for this compound (P21/c (no. 14). KW - EOS KW - High-pressure KW - Nitrides PY - 2019 DO - https://doi.org/10.1002/ejic.201900488 IS - 32 SP - 3667 EP - 3671 PB - Wiley AN - OPUS4-48924 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Khandarhaeva, S. A1 - Fedotenko, T. A1 - Pakhomova, A. A1 - Gromilov, S. A1 - Dubrovinsky, L. A1 - Dubrovinskaia, N. A1 - Yusenko, Kirill T1 - Equations of state of rhodium, iridium and their alloys up to 70 GPa JF - Journal of Alloys and Compounds N2 - Knowledge of the compressional and thermal behaviour of metals and alloys is of a high fundamental and applied value. In this work, we studied the behaviour of Ir, Rh, and their fcc-structured alloys, Ir0.42Rh0.58 and Ir0.26Os0.05Pt0.31Rh0.23Ru0.15, up to 70 GPa using the diamond anvil cell technique with synchrotron X-ray diffraction. We found that all these materials are structurally stable upon room-temperature hydrostatic compression in the whole pressure interval, as well as upon heating to 2273 K both at ambient and high pressure. Rh, Ir0.42Rh0.58 and Ir0.26Os0.05Pt0.31Rh0.23Ru0.15 were investigated under static compression for the first time. According to our data, the compressibility of Ir, Rh, fcc–Ir0.42Rh0.58, and fcc Ir0.26Os0.05Pt0.31Rh0.23Ru0.15, can be described with the 3rd order Birch-Murnaghan equation of state with the following parameters: V0 = 14.14(6) Å3·atom−1, B0 = 341(10) GPa, and B0' = 4.7(3); V0 = 13.73(7) Å3·atom−1, B0 = 301(9) GPa, and B0' = 3.1(2); V0 = 13.90(8) Å3·atom−1, B0 = 317(17) GPa, and B0' = 6.0(5); V0 = 14.16(9) Å3·atom−1, B0 = 300(22) GPa, B0' = 6(1), where V0 is the unit cell volume, B0 and B0' – are the bulk modulus and its pressure derivative. KW - EOS KW - Rh-Ir alloys KW - High-entropy alloys KW - High-pressure PY - 2019 DO - https://doi.org/10.1016/j.jallcom.2019.02.206 VL - 788 SP - 212 EP - 218 PB - Elsevier B.V. AN - OPUS4-47404 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -