Journal of Materials Science

, Volume 42, Issue 22, pp 9379–9391 | Cite as

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
Article

Abstract

The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba1.2−xCsxMg1.2−x/2Ti6.8+x/2O16 and Ba1.2−xCsxAl2.4−xTi5.6+xO16 have been studied using powder neutron diffraction and 133Cs and 27Al 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.

Notes

Acknowledgments

The authors wish to acknowledge the help of Dr E.R. Maddrell at British Nuclear Fuels Limited for helpful discussions, CMI—The Cambridge MIT Institute (KRW) and the EPSRC for funding this work.

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Karl R. Whittle
    • 1
    • 2
  • Sharon E. Ashbrook
    • 1
    • 3
  • Gregory R. Lumpkin
    • 1
    • 4
  • Ian Farnan
    • 1
  • Ronald I. Smith
    • 5
  • Simon A. T. Redfern
    • 1
  1. 1.Department of Earth Sciences, Cambridge Centre for Ceramic ImmobilisationUniversity of CambridgeCambridgeUK
  2. 2.Department of Engineering MaterialsUniversity of SheffieldSheffieldUK
  3. 3.Department of ChemistryUniversity of St AndrewsNorth Haugh, St Andrews, FifeUK
  4. 4.Australian Nuclear Science and Techonology Organisation (ANSTO), PMB 1MenaiAustralia
  5. 5.ISIS Facility, Rutherford Appleton LaboratoryChilton, Didcot, OxfordshireUK

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