High-pressure synthesis of noble metal hydrides

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 s...

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Bibliographic Details
Published inThe Journal of chemical physics Vol. 138; no. 13; p. 134507
Main Authors Donnerer, Christian, Scheler, Thomas, Gregoryanz, Eugene
Format Journal Article
LanguageEnglish
Published United States 07.04.2013
Subjects
Compressibility
Copper
Gold
Hydrides
Interstitials
Noble metals
Phases
Silver
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Summary: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.
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ISSN:0021-9606
1089-7690
1089-7690
DOI:10.1063/1.4798640