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Structural Studies of Hollandite-Based Radioactive Waste Forms

Published online by Cambridge University Press:  01 February 2011

K. R. Whittle ,
S. E. Ashbrook ,
S.A.T. Redfern ,
G. R. Lumpkin ,
J. P. Attfield ,
M. Dove  and
I. Farnan
K. R. Whittle
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
S. E. Ashbrook
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
S.A.T. Redfern
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
G. R. Lumpkin
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
J. P. Attfield
Affiliation:
Dept of Chemistry, University of Cambridge, Cambridge, United Kingdom
M. Dove
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
I. Farnan
Affiliation:
Cambridge Centre for Ceramic Immobilisation - C3i, Dept Of Earth Sciences, University of Cambridge, Cambridge, United Kingdom.
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Abstract

Hollandites with compositions Ba1.2-xCsxMg1.2-x/2Ti6.8+x/2 O16, and Ba1.2-xCsxAl2.4-xTi5.6+xO16 (x=0, 0.1, 0.25) have been synthesised using a modified alkoxide/acetate precursor route. The samples have been sintered using two procedures; hot isostatic pressing and sintering at ambient pressure. X-ray powder diffraction has shown samples from both systems to form tetragonal hollandites, with little change when pressed by both methods. Cs-133 MAS NMR spectra have been recorded showing the chemical shift in Al containing samples to be ∼250ppm, and in Mg hollandites ∼175ppm and 200ppm, with little change when prepared by both methods.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 339
Copyright
Copyright © Materials Research Society 2004

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References

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