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Structural Studies of Hollandite-Based Radioactive Waste Forms

  • K. R. Whittle (a1), S. E. Ashbrook (a1), S.A.T. Redfern (a1), G. R. Lumpkin (a1), J. P. Attfield (a2), M. Dove (a1) and I. Farnan (a1)...

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.

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