Nanocrystalline tungsten hydrides at high pressures
Physical Review B—Condensed Matter and Materials Physics, 2013•APS
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 WH n with n∼ 1 1 3. Synchrotron x-ray diffraction and transmission electron
microscopy (TEM) measurements demonstrate the formation of a nanocrystalline …
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 WH n with n∼ 1 1 3. Synchrotron x-ray diffraction and transmission electron
microscopy (TEM) measurements demonstrate the formation of a nanocrystalline …
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 WH with . 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 20 nm, a structure similar to nanocrystalline diamond.
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