Pressure dependence of anharmonic effective pair potentials in rock salt type AgI

Akira Yoshiasa, Hiroshi Fukui, Hiroshi Arima, Maki Okube, Yoshinori Katayama, Kei ichiro Murai, Masahiko Sugahara, Osamu Ohtaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Pressure dependence of anharmonic effective pair potentials V(u)=au 2/2+bu3/3! for the IAg bond in rock salt type AgI has been investigated by EXAFS Debye-Waller factors. EXAFS measurements near the I K-edge were performed under pressure up to 6.0 GPa using a multi-anvil high-pressure device and synchrotron radiation from SPring-8, Hyogo. The potential parameter a for rock-salt type is 1.66(5) eV/A2 at 1.0 GPa and increases to 1.88(6) eV/A2 at 6.0 GPa. The phonon energies in rock salt type AgI under pressure have been estimated using the potential parameter a by calculating the dynamical matrix. The anharmonic effective pair potential for each phase is influenced by pressure and becomes steeper with increasing pressure while the extent of anharmonicity decreases with pressure.

Original languageEnglish
Title of host publicationX-RAY ABSORPTION FINE STRUCTURE - XAFS13
Subtitle of host publication13th International Conference
Pages569-571
Number of pages3
DOIs
Publication statusPublished - 2007 Mar 26
EventX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference - Stanford, CA, United States
Duration: 2006 Jul 92006 Jul 14

Publication series

NameAIP Conference Proceedings
Volume882
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherX-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference
CountryUnited States
CityStanford, CA
Period06/7/906/7/14

Keywords

  • High pressure EXAFS
  • Pair potentials and forces
  • Phase transitions
  • Phonon energies in Agl

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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  • Cite this

    Yoshiasa, A., Fukui, H., Arima, H., Okube, M., Katayama, Y., Murai, K. I., Sugahara, M., & Ohtaka, O. (2007). Pressure dependence of anharmonic effective pair potentials in rock salt type AgI. In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference (pp. 569-571). (AIP Conference Proceedings; Vol. 882). https://doi.org/10.1063/1.2644596