Plastic domain and ionic conductivity of (C4H9)4NI

Ryou Asayama, Junichi Kawamura, Takeshi Hattori

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Unusual ionic transport in tetrabutylammonium iodide (C4H9)4NI (TBAI) was observed by high resolution proton NMR spectroscopy accompanied by diffusion experiments. Some parts of the TBA cations are diffusing not only in the plastic phase II, but in the low temperature ordered phase I as well. The diffusing TBA ions are considered to be inside the remaining plastic domains dispersed in the ordered crystal matrix. The volume fraction of the plastic domain is evaluated from the observed narrow component of the proton NMR spectra. The observed unusual temperature dependence of the diffusion coefficient can be explained by assuming a manifold decrease of the dimension of the plastic domain in phase I. The differences in degree of crystallinity at the interface of plastic domains with respect to its surroundings led to the surface enhancement of diffusivity in phase I. Finally, the observed ionic conductivity is compared with the estimation from the diffusion coefficient and mobile cation densities. The results suggest that only a fraction of the cations take part in the observed ionic conductivity.

Original languageEnglish
Pages (from-to)3245-3249
Number of pages5
JournalSolid State Ionics
Volume177
Issue number37-38
DOIs
Publication statusPublished - 2006 Dec 1

Keywords

  • Alkylammonium halides
  • Plastic crystal
  • Plastic domain model
  • Proton NMR spectra
  • Proton diffusion coefficients

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Plastic domain and ionic conductivity of (C<sub>4</sub>H<sub>9</sub>)<sub>4</sub>NI'. Together they form a unique fingerprint.

Cite this