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 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 U6 - 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 - Pechenyuk, S A1 - Vikulova, E A1 - Semushina, Y A1 - Baidina, I A1 - Filatov, E A1 - Yusenko, Kirill T1 - Isostructurality and Thermal Properties in the Series of Double Complex Salts [M-1(NH3)(6)][M-2(C2O4)(3)]center dot 3H(2)O (M-1 = Co, Ir, M-2 = Fe, Cr) T1 - ИЗОСТРУКТУРНОСТЬ И ТЕРМИЧЕСКИЕ СВОЙСТВА В РЯДУ ДВОЙНЫХ КОМПЛЕКСНЫХ СОЛЕЙ СОСТАВА N2 - Preparation of new bimetallic compounds, including double complex salts (DCSs), containing both a platinumgroup metal and a transition metal of the fourth period is of great interest since these compounds can act as precursors of bimetallic materials. One example of using such compounds is the preparation of ultrafine particles of solid solutions of metals or intermetallic compounds on various supports to fabricate highly efficient catalysts with a low content of noble metals. Compounds containing coordinated oxalate anions are important objects of synthetic chemistry and interesting precursors. For example, a lot of attention is given to salts with [M(C2O4)2]2– anions, where M = Co, Ni, Cu, Pt, Pd. On the one hand, the uniqueness of oxalate coordinated anions is due to the fact that they are easily obtained and are stable both in aqueous solutions and in the solid phase; on the other hand, they are thermally decomposed at relatively low temperatures, which makes them promising precursors for the fabrication of metallic and oxide materials. N2 - Синтезирован ряд из четырех изоструктурных двойных комплексных солей, построенных на основе катионов [М1(NH3)6]3+ и анионов [M2(C2O4)3]3-, где M1 = Co, Ir, M2 = Fe, Cr. Соли кристаллизуются в гексагональной пространственной группе симметрии P`3c1. Согласно данным термического анализа в атмосфере аргона, термическая устойчивость (температуры начала разложения обезвоженных продуктов) изучаемых соединений зависит от природы комплексного трисоксалатного аниона и увеличивается в рядах [Ir(NH3)6][Co(C2O4)3] < [Ir(NH3)6][Fe(C2O4)3] < [Ir(NH3)6][Cr(C2O4)3] < [Ir(NH3)6][Ir(C2O4)3] и [Co(NH3)6][Co(C2O4)3] < [Co(NH3)6][Fe(C2O4)3] < [Co(NH3)6][Cr(C2O4)3] < [Co(NH3)6][Ir(C2O4)]. При этом при одинаковом анионе соли гексаммина иридия(III) более устойчивы по сравнению с солями кобальта(III)). При термическом разложении солей [Co(NH3)6][Fe(C2O4)3]·3H2O и [Ir(NH3)6][Fe(C2O4)3] 3H2O в атмосфере водорода образуются твердые растворы Co0,5Fe0,5 и Ir0,5Fe0,5 соответственно. KW - Single-source precursors KW - Double complex salts KW - Catalysts PY - 2019 UR - https://doi.org/10.1134/S0022476619070060 U6 - https://doi.org/10.26902/JSC_id42958 VL - 60 IS - 7 SP - 1110 EP - 1119 PB - Springer AN - OPUS4-48925 LA - mul AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Yusenko, Kirill A1 - de Oliveira Guilherme Buzanich, Ana A1 - Radtke, Martin A1 - Reinholz, Uwe A1 - Riesemeier, Heinrich A1 - Emmerling, Franziska T1 - BAMline 2.0 – further technical developments for a broader multipurpose hard X-ray beamline at BESSY II N2 - We show further development of our beamline in the contexst of further itermational collaboration. T2 - PACC and AfSC CY - Accra, Ghana DA - 28.01.2019 KW - Synchrotron radiation PY - 2019 AN - OPUS4-47317 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Domonov, D.P. A1 - Pechenyuk, S.I. A1 - Semushina, Y.P. A1 - Yusenko, Kirill T1 - Solid state transformation in inner coordination sphere of [Co(NH3)6][Fe(C2O4)3]·3H2O as a route to access catalytically active Co-Fe materials N2 - Thermal decomposition of [Co(NH₃)₆][Fe(C₂O₄)₃]∙3H₂O in argon atmosphere, at a low heating rate (3°/min), and in large amounts of the initial complex (~0.1 mole), has been studied. It was possible to distinguish four decomposition steps upon heating: In the temperature range of 50⁻100 °C-the loss of crystal water; 100⁻190 °C-stability region of dehydrated complex; 230⁻270 °C-the range of stability of intermediate phase with the formula CoFe(NH₃)₂(C₂O₄)₂; 270⁻350 °C-thermal decomposition of the intermediate with the formation of metallic products and further air oxidation with the formation of Co1.5Fe1.5O₄. Catalytic properties of thermolysis products were tested in the decomposition reaction of H₂O₂ (inactive), oxidation of acetone (average activity), and decomposition of ammonium perchlorate (highly active). KW - Double complex salts KW - Catalysts KW - Single-source precursors PY - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:b43-474014 SN - 1996-1944 VL - 12 IS - 2 SP - 221, 1 EP - 10 PB - mdpi CY - Zürich AN - OPUS4-47401 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Baek, W. A1 - Gromilov, S. A1 - Kuklin, A. A1 - Kovaleva, E. A1 - Fedorov, A. A1 - Sukhikh, Alex A1 - Hanfland, M. A1 - Pomogaev, V. A1 - Melchakova, Y. A1 - Avramov, P. A1 - Yusenko, Kirill T1 - Unique Nanomechanical Properties of Diamond-Lonsdaleite Biphases: Combined Exp and Theor consideration of popigai impact diamonds N2 - For the first time, lonsdaleite-rich impact diamonds from one of the largest Popigai impact crater (Northern Siberia) with a high concentration of structural defects are investigated under hydrostatic compression up to 25 GPa. It is found that, depending on the nature of a sample, the bulk modulus for lonsdaleite experimentally obtained by X-ray diffraction in diamond-anvil cells is systematically lower and equal to 93.3−100.5% of the average values of the bulk moduli of a diamond matrix. Density functional theory calculations reveal possible coexistence of a number of diamond/lonsdaleite and twin diamond biphases. Among the different mutual configurations, separate inclusions of one lonsdaleite (001) plane per four diamond (111) demonstrate the lowest energy per carbon atom, suggesting a favorable formation of single-layer lonsdaleite (001) fragments inserted in the diamond matrix. Calculated formation energies and experimental diamond (311) and lonsdaleite (331) powder X-ray diffraction patterns indicate that all biphases could be formed under high-temperature, high-pressure conditions. Following the equation of states, the bulk modulus of the diamond (111)/lonsdaleite (001) biphase is the largest one among all bulk moduli, including pristine diamond and lonsdaleite. KW - Compressibility KW - Lonsdaleite KW - Impact diamonds PY - 2019 U6 - https://doi.org/10.1021/acs.nanolett.8b04421 VL - 19 IS - 9 SP - 1570 EP - 1576 PB - ACS AN - OPUS4-47403 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 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 U6 - 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 -