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The effect of caesium on barium hollandites studied by neutron diffraction and magic-angle spinning (MAS) nuclear magnetic resonance |
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| Authors: | Karl R. Whittle Sharon E. Ashbrook Gregory R. Lumpkin Ian Farnan Ronald I. Smith Simon A. T. Redfern |
| Affiliation: | (1) Department of Earth Sciences, Cambridge Centre for Ceramic Immobilisation, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK;(2) Department of Engineering Materials, University of Sheffield, Mappin Street, Sheffield, S1 3JD, UK;(3) Present address: Department of Chemistry, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9ST, UK;(4) Present address: Australian Nuclear Science and Techonology Organisation (ANSTO), PMB 1, Menai, NSW, 2234, Australia;(5) ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK |
| 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 O16 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. |
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