Search results for "Arsenolite"

Ordered helium trapping and bonding in compressed arsenolite: Synthesis ofAs4O6·2He

2016

Compression of arsenolite has been studied from a joint experimental and theoretical point of view. Experiments on this molecular solid at high pressures with different pressure-transmitting media have been interpreted thanks to state-of-the-art ab initio calculations. Our results confirm arsenolite as one of the most compressible minerals and provide evidence for ordered helium trapping above 3 GPa between adamantane-type $\mathrm{A}{\mathrm{s}}_{4}{\mathrm{O}}_{6}$ cages. Our calculations indicate that, at relatively small pressures, helium establishes rather localized structural bonds with arsenic forming a compound with stoichiometry $\mathrm{A}{\mathrm{s}}_{4}{\mathrm{O}}_{6}\ifmmode\c…