Concentration dependence in NMR spectra and study of incommensurability, phase transitions and molecular dynamics in graphite intercalation compounds and zeolites

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4 Scopus citations

Abstract

A distinct fine structure in the NMR spectra of fluorinated graphite intercalation compounds is obtained due to the selective motional averaging of the 'undesirable' intermolecular dipole-dipole interactions. Through analysis of these spectra, the arrangement of the guest molecules has been obtained. A decrease of the activation energy of diffusion with increased molecular concentration has been observed in a stage 1 sample of fluorinated graphite (C2F)n intercalated with acetone. These results are discussed along with similar results for Li diffusion in LixNbSe3 and LixTiS2 from the literature; we propose that such behavior is caused by the formation of a guest sublattice which is incommensurate with the host lattice. Unusual temperature and concentration dependences of the 1H, 203Tl and 205Tl spectra in narrow-pore Tl-natrolite show that the set of positions occupied by water molecules and Tl+ ions changes continuously with the temperature. In this case, the water and Tl sublattice may be incommensurate with the aluminosilicate framework.

Original languageEnglish
Pages (from-to)1031-1036
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume57
Issue number6-8
DOIs
StatePublished - 1 Jan 1996

Keywords

  • A. graphite intercalation compounds
  • A. zeolites
  • D. diffusion
  • D. incommensurate phase
  • D. nuclear magnetic resonance (NMR)

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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