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

Whittle, K. R. and Ashbrook, S. E. and Lumpkin, G. R. and Farnan, I. and Smith, R. I. and Redfern, S. A. T. (2007) The effect of caesium on barium hollandites studied by neutron diffraction and magic-angle spinning (MAS) nuclear magnetic resonance. Journal of Materials Science, 42 (22). pp. 9379-9391. ISSN 0022-2461 (Print) 1573-4803 (Online) DOI 10.1007/s10853-007-1815-3

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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 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.

Item Type:	Article
Uncontrolled Keywords:	2007 AREP IA55 2007 P
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Journal of Materials Science
Volume:	42
Page Range:	pp. 9379-9391
Identification Number:	10.1007/s10853-007-1815-3
Depositing User:	Sarah Humbert
Date Deposited:	16 Feb 2009 13:04
Last Modified:	23 Jul 2013 10:09
URI:	http://eprints.esc.cam.ac.uk/id/eprint/802

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