Formation of H2-rich iodine-hydrogen compounds at high pressure

Jack Binns, Philip Dalladay-Simpson, Mengnan Wang, Graeme Ackland, Eugene Gregoryanz, Ross T. Howie

Research output: Contribution to journalArticlepeer-review

Abstract

We have used synchrotron x-ray and Raman spectroscopic studies combined with molecular dynamics to investigate the I-2-H-2 system at high pressure. By laser heating the mixture above 25 GPa we synthesized the molecular compound HI(H-2)(13), with the AB(13) structure type and unusually high volumetric hydrogen content. The isolation of HI molecules by (H-2)(13) supramolecular clusters stabilizes the compound over a remarkable pressure range from 9 to at least 130 GPa. At lower pressures and 300 K another compound, hydrogen diiodane H-2(HI)(2), spontaneously forms, being stable up to 12.5 GPa.

Original languageEnglish
Article number024111
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume97
Issue number2
DOIs
Publication statusPublished - 24 Jan 2018

Keywords

  • METAL-ORGANIC FRAMEWORKS
  • X-RAY-DIFFRACTION
  • MOLECULAR DISSOCIATION
  • DENSE HYDROGEN
  • SOLID IODINE
  • STORAGE
  • PHASE
  • DEUTERIUM
  • SPECTRA
  • SYSTEM

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