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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).
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.
IGUS is the International Group of Experts on the Explosion Risks of Unstable Substances. IGUS was established in 1962 with the objective to harmonize test methods used by different countries to identify and quantify the explosive properties of unstable materials. Over the years, IGUS has continued to offer scientists, who are advisers to their governments, and others, a forum to exchange data and information. The Energetic and Oxidizing Substances (EOS) working group as a sub-group of IGUS is dealing with test methods, Classification and safety aspects relating to organic peroxides, self-reactive substances and other energetic substances, fertilizers, ammonium nitrate and oxidizers.
The EOS working group holds an annual meeting alternating between Europe, the United States and Japan. The 2011 meeting took place from the 27th to the 29th of April 2011 at the Madison Hotel in Washington, D. C. The meeting was hosted by the Organic Peroxide Producers Safety Division (OPPSD) of the Society of Plastics Industry, Inc. (SPI). This was the fourth EOS meeting held in the USA since 1994. Of particular importance is the fact that 39 colleagues from authorities, universities, research institutes and industries attended the meeting. The delegates came from USA, Canada, China, France, The Netherlands, Norway, Sweden, Italy, Japan, United Kingdom and Germany. This confirms the breadth and scope of this forum and the value the participants associate with being able to contact other colleagues from around the world enabling the effective exchange of scientific results and discussion on the wide-ranging Problems concerning energetic and oxidizing materials.