High-pressure dissociation of silver mercury iodide, Ag 2HgI 4

D. C. Parfitt, S. Hull, D. A. Keen, W. Crichton

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Representative X-ray diffraction spectra illustrating the pressure-induced dissociation of Ag 2HgI 4 into rocksalt-structured AgI (marked with arrows in the bottom three plots) and HgI 2. A structural phase transition is observed within the latter at ≈1.3 GPa. High-pressure X-ray diffraction has been used to probe the behavior of the superionic conductor silver mercury iodide (Ag 2HgI 4) at pressures up to 5 GPa and at temperatures from 295 to 370 K. Significant changes in the diffraction spectra, indicative of structural transitions, are observed around 0.7 and 1.3 GPa across the range of temperatures studied. The change at 0.7 GPa is shown to correspond to the dissociation of silver mercury iodide into silver iodide and mercury iodide, i.e., Ag 2HgI 4→ 2AgI+HgI 2. The second transition, at 1.3 GPa, is due to a structural phase transition within HgI 2. Rietveld analysis of the diffraction data is used to confirm and refine all the known crystal structures.

Original languageEnglish
Pages (from-to)3715-3720
Number of pages6
JournalJournal of Solid State Chemistry
Volume177
Issue number10
DOIs
Publication statusPublished - 1 Oct 2004
Externally publishedYes

Keywords

  • Dissociation
  • High-pressures
  • Silver mercury iodide
  • Superionic conduction
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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