Neutron scattering studies on superionic AgI-CsI-(CH 3 ) 4 NI glasses

Junichi Kawamura, Koichi Arakawa, Takashi Kamiyama, Yoshio Nakamura

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2 Citations (Scopus)

Abstract

Quasielastic and inelastic neutron scattering from AgI-CsI-(CH 3 ) 4 NI and AgI-CsI-(CD 3 ) 4 NI superionic glasses were measured as a function of temperature. At the lowest temperatures, vibrational modes from internal motion of (CH 3 ) 4 N + or (CD 3 ) 4 N + were observed above 15 meV. Below 20 meV, a broad peak typical of AgI-containing glasses was observed, which showed significant temperature dependence. This mode is attributable to the vibrational motion of localized Ag + ions. Above 173 K, quasielastic scatterings were seen below 2 meV; these were fitted by the sum of a single Lorentzian, an elastic peak and background components. The half-width at half-maximum (HWHM) of the Lorentzian component was almost Q-independent at higher Q values, and its temperature dependence was lower than the value expected from dc conductivity. This quasi-elastic component may be attributed to the local hopping of Ag + in the AgI cluster of the glass and/or the rotational motion of (CD 3 ) 4 N + ions.

Original languageEnglish
Pages (from-to)264-272
Number of pages9
JournalSolid State Ionics
Volume79
Issue numberC
DOIs
Publication statusPublished - 1995 Jan 1
Externally publishedYes

Keywords

  • Neutron scattering
  • Silver iodide tetramethylammonium
  • Superionic conductor glass

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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