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How and Why Does Helium Permeate Nonporous Arsenolite Under High Pressure?

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dc.abstract.enInvestigations into the helium permeation of arsenolite, the cubic, molecular arsenic(III) oxide polymorph As4O6, were carried out to understand how and why arsenolite helium clathrate As4O6⋅2 He is formed. High-pressure synchrotron X-ray diffraction experiments on arsenolite single crystals revealed that the permeation of helium into nonporous arsenolite depends on the time for which the crystal is subjected to high pressure and on the crystal history. The single crystal was totally transformed into As4O6⋅2 He within 45 h under 5 GPa. After release of the pressure, arsenolite was recovered and a repeated increase in pressure up to 3 GPa led to practically instant As4O6⋅2 He formation. However, when a pristine arsenolite single crystal was quickly subjected to a pressure of 13 GPa, no helium permeation was observed at all. No neon permeation was observed in analogous experiments. Quantum mechanical computations indicate that there are no specific attractive interactions between He atoms and As4O6 molecules at the distances observed in the As4O6⋅2 He crystal structure. Detailed analysis of As4O6 molecular structure changes has shown that the introduction of He into the arsenolite crystal lattice significantly reduces molecular deformations by decreasing the anisotropy of stress exerted on the As4O6 molecules. This effect and the pΔV term, rather than any specific As⋅⋅⋅He binding, are the driving forces for the formation As4O6⋅2 He.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorZachara, Janusz
dc.contributor.authorDranka, Maciej
dc.contributor.authorGuńka, Piotr
dc.contributor.authorHanfland, Michael
dc.contributor.authorHapka, Michał
dc.contributor.authorChałasiński, Grzegorz
dc.date.accessioned2024-01-25T03:29:25Z
dc.date.available2024-01-25T03:29:25Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number7
dc.description.volume19
dc.identifier.doi10.1002/CPHC.201701156
dc.identifier.issn1439-4235
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/108620
dc.identifier.weblinkhttps://onlinelibrary.wiley.com/doi/abs/10.1002/cphc.201701156
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofChemPhysChem
dc.relation.pages857-864
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enarsenic
dc.subject.enhelium
dc.subject.enhigh-pressure chemistry
dc.subject.eninclusion compounds
dc.subject.enX-ray diffraction
dc.titleHow and Why Does Helium Permeate Nonporous Arsenolite Under High Pressure?
dc.typeJournalArticle
dspace.entity.typePublication