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High-pressure synthesis of noble metal hydrides

DOI: 10.1063/1.4798640 DOI Help

Authors: Christian Donnerer (London Centre for Nanotechnology) , Thomas Scheler (University of Edinburgh) , Eugene Gregoryanz (School of Physics and Centre for Science at Extreme Conditions, The University of Edinburgh)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The Journal Of Chemical Physics , VOL 138 (13)

State: Published (Approved)
Published: April 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, Cu 2H, 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 Cu 2H) 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.

Journal Keywords: Copper; High Pressure; Gold

Subject Areas: Materials

Instruments: I15-Extreme Conditions

Other Facilities: ESRF; PETRA

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