Cation dynamics of stabilized α-AgI in AgI-Ag2O-MoO3 glasses, studied by Ag-109 NMR spectroscopy

Naoaki Kuwata, Taira Saito, Masahiro Tatsumisago, Tsutomu Minami, Junichi Kawamura

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Ag-109 NMR spectra and their relaxation times were measured for composites containing stabilized α-AgI in glass matrices, which were prepared by a rapid quenching of melts (type A), or heating and consecutive cooling of the homogeneous glass (type B). Below -20 °C, the spectrum for the 74AgI·8.7Ag2·O17.3MoO3 composite of type B split into two peaks attributable to the α-AgI and the glass matrix. From this splitting, the exchange time τex of silver ion between the α-AgI and the matrix glass was estimated to be about 0.3 ms at -20 °C. On the other hand, three peaks due to matrix glass, α-AgI and β-AgI were observed in the type A composite of 82AgI·6Ag2O·12MoO3, where no exchange was observed. Temperature dependence of the longitudinal relaxation time T1 of stabilized α-AgI was measured for the first time. The value of τex for the type B composite is in good agreement with that calculated from a jump diffusion model. The silver ions in the type B composites transfer more smoothly across the interface between the α-AgI and the glass matrix than those in type A composite.

Original languageEnglish
Pages (from-to)79-91
Number of pages13
JournalJournal of Non-Crystalline Solids
Volume324
Issue number1-2
DOIs
Publication statusPublished - 2003 Aug 15

ASJC Scopus subject areas

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

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