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Surface Alteration of Titanate Ceramics in Aqueous Media

Published online by Cambridge University Press:  10 February 2011

E. R. Vance ,
N. Dytlewski ,
K. E. Prince ,
K. P. Hart  and
E. Loi
E. R. Vance
Affiliation:
ANSTO, Menai, NSW 2234, Australia
N. Dytlewski
Affiliation:
ANSTO, Menai, NSW 2234, Australia
K. E. Prince
Affiliation:
ANSTO, Menai, NSW 2234, Australia
K. P. Hart
Affiliation:
ANSTO, Menai, NSW 2234, Australia
E. Loi
Affiliation:
ANSTO, Menai, NSW 2234, Australia
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Abstract

From elastic recoil detection analysis (ERDA) of 2 MeV He ions and secondary ion mass spectroscopy (SIMS), exposure of Synroc-C to D2O at 150°C for ∼ 30 days produced surface deuteration products of a few nm in thickness, with surface roughness after polishing down to 0.25 µm diamond finish not being of critical importance in the thickness determination. Reaction at 250°C produced more extensive deuteration and general surface alteration, over depths of about a micron. SIMS did not show any surface enhancement of rare earths or Zr on Synroc-C surfaces reacted at 90°C for up to 336 days. Pu-doped SynrocC exposed to deionised water at 70°C showed surface depletion of Pu by alpha-spectroscopy. Zirconolite-rich Synroc showed less surface deuteration than Synroc-C after reaction for 3 weeks at 150°C in D2O. Admixtures of 0.001 M of fluoride ions to dilute HCI (pH = 2) produced deposits of anatase, ∼ 20 µm thick, on perovskite after a few weeks at 90°C; these deposits were much thicker than those produced by the dilute HCI without the fluoride ions being present.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 379
Copyright
Copyright © Materials Research Society 2000

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References

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