The effect of caesium on barium hollandites studied by neutron diffraction and magic-angle spinning (MAS) nuclear magnetic resonance

Karl R. Whittle, Sharon E. Ashbrook, Gregory R. Lumpkin, Ian Farnan, Ronald I. Smith, Simon A. T. Redfern

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba1.2-x Cs (x) Mg1.2-x/2Ti6.8+x/2O16 and Ba1.2-x Cs (x) Al2.4-x Ti5.6+x O-16 have been studied using powder neutron diffraction and Cs-133 and Al-27 MAS NMR. Addition of Cs to the monoclinic structure induces a 'shear-type collapse', in agreement with previously published results. NMR spectra show that the addition of Cs does not change the local structure around the Al cations within the tunnel walls. An algorithm is given that allows a prediction of unit cell parameters to be made for tetragonal hollandites containing barium.

Original languageEnglish
Pages (from-to)9379-9391
Number of pages13
JournalJournal of Materials Science
Volume42
Issue number22
DOIs
Publication statusPublished - Nov 2007

Keywords

  • MULTIPLE-QUANTUM MAS
  • EFFECTIVE IONIC-RADII
  • STRUCTURAL-ANALYSIS
  • QUADRUPOLAR NUCLEI
  • NMR-SPECTRA
  • PHASE
  • SUBSTITUTION
  • POTASSIUM
  • STATE
  • PURE

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