Nanocrystalline tungsten hydrides at high pressures

Thomas Scheler, Feng Peng, Christophe L. Guillaume, Ross T. Howie, Yanming Ma, Eugene Gregoryanz*

*Corresponding author for this work

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Abstract / Description of output

A combined experimental and theoretical study has been carried out on the synthesis and characterization of tungsten hydride at high pressures. We confirm the synthesis of tungsten monohydride at above 25 GPa and 300 K. At higher pressures, hydrogen content is found to increase and ab-initio calculations reveal the formation of overstoichiometric tungsten hydride WHn with n similar to 11/3. Synchrotron x-ray diffraction and transmission electron microscopy (TEM) measurements demonstrate the formation of a nanocrystalline microstructure upon hydrogenation. TEM micrographs show elongated grains with diameters of similar to 20 nm, a structure similar to nanocrystalline diamond.

Original languageEnglish
Article number184117
Number of pages6
JournalPhysical review B
Issue number18
Publication statusPublished - 30 May 2013

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