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

doi:10.1007/s10853-007-1815-3

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba_1.2-x Cs _x Mg _1.2-x/2Ti_6.8+x/2O₁₆ and Ba_1.2-x Cs _x Al_2.4-x Ti_5.6+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.

Original language	English
Pages (from-to)	9379-9391
Number of pages	13
Journal	Journal of Materials Science
Volume	42
Issue number	22
DOIs	https://doi.org/10.1007/s10853-007-1815-3
Publication status	Published - Nov 2007
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

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

abstract = "The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba1.2-x Cs x Mg 1.2-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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AU - Whittle, Karl R.

AU - Ashbrook, Sharon E.

AU - Lumpkin, Gregory R.

AU - Farnan, Ian

AU - Smith, Ronald I.

AU - Redfern, Simon A.T.

PY - 2007/11

Y1 - 2007/11

N2 - The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba1.2-x Cs x Mg 1.2-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.

AB - The structural effects of incorporating Cs into the monoclinic and tetragonal hollandites Ba1.2-x Cs x Mg 1.2-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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The effect of caesium on barium hollandites studied by neutron diffraction and magic-angle spinning (MAS) nuclear magnetic resonance

Abstract

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