In situ XAFS and XRD studies of pressure-induced local structural change in liquid AgI

Hiroshi Arima, O. Ohtaka, T. Hattori, Y. Katayama, W. Utsumi, A. Yoshiasa

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In order to examine the pressure-induced structural change of liquid silver iodide (AgI), high-pressure and high-temperature in situ x-ray absorption fine structure (XAFS) and x-ray diffraction (XRD) studies have been carried out up to 1200K and 6GPa. The modifications in the x-ray absorption near edge structure (XANES) spectra and x-ray structure factors, S(Q), with increasing pressure provide evidence for changes in the short-range order of liquid AgI. The I-Ag bond length in liquid AgI increases by compression up to 2GPa, which proposes that components with higher coordination than fourfold are introduced. The I-Ag bond length decreases monotonically with compression above 2GPa, indicating that the structural change involving a coordination-number change is completed below 2GPa and then a high-pressure form of liquid AgI is stabilized. Comparing the I-Ag bond lengths of liquid AgI with those of crystalline phases, we conclude that the high-pressure form of liquid AgI has a rocksalt-like structure with large vacancies.

Original languageEnglish
Article number076104
JournalJournal of Physics Condensed Matter
Volume19
Issue number7
DOIs
Publication statusPublished - 2007 Feb 14

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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