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On the Reactivity of Hydrogen-Helium and Hydrogen-Nitrogen at High Pressures

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arxiv 1807.06227 v1 pith:ZDD4LYPY submitted 2018-07-17 cond-mat.mtrl-sci

On the Reactivity of Hydrogen-Helium and Hydrogen-Nitrogen at High Pressures

classification cond-mat.mtrl-sci
keywords associationchemicalcompoundsformationhighhydrogen-heliumhydrogen-nitrogenpressures
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Through a series of Raman spectroscopy studies, we investigate the behaviour of hydrogen-helium and hydrogen-nitrogen mixtures at high pressure across wide ranging concentrations. We find that there is no evidence of chemical association, miscibility, nor any demixing of hydrogen and helium in the solid state up to pressures of 250 GPa at 300 K. In contrast, we observe the formation of concentration-dependent N$_2$-H$_2$ van der Waals solids, which react to form N-H bonded compounds above 50 GPa. Through this combined study, we can demonstrate that the recently claimed chemical association of H$_2$-He can be attributed to significant N$_2$ contamination and subsequent formation of N$_2$-H$_2$ compounds.

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