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High-pressure synthesis of noble metal hydrides

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Original languageEnglish
Article number134507
Number of pages5
JournalThe Journal of Chemical Physics
Volume138
Issue number13
DOIs
Publication statusPublished - 7 Apr 2013

Abstract

The formation of hydride phases in the noble metals copper, silver, and gold was investigated by in situ x-ray diffraction at high hydrogen pressures. In the case of copper, a novel hexagonal hydride phase, Cu2H, was synthesised at pressures above 18.6 GPa. This compound exhibits an anti-CdI2-type structure, where hydrogen atoms occupy every second layer of octahedral interstitial sites. In contrast to chemically produced CuH, this phase does not show a change in compressibility compared to pure copper. Furthermore, repeated compression (after decomposition of Cu2H) led to the formation of cubic copper hydride at 12.5 GPa, a phenomenon attributed to an alteration of the microstructure during dehydrogenation. No hydrides of silver (up to 87 GPa) or gold (up to 113 GPa) were found at both room and high temperatures. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4798640]

    Research areas

  • COPPER HYDRIDE, CRYSTAL-STRUCTURE, HYDROGEN, GOLD, SYSTEM, RANGE, PHASE, GPA

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