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Fabrication, characterization, and leach testing of hollandite, (Ba,Cs)(Al,Ti)2Ti6O16

Published online by Cambridge University Press:  31 January 2011

M. L. Carter ,
E. R. Vance ,
D. R. G. Mitchell ,
J. V. Hanna ,
Z. Zhang  and
E. Loi
M. L. Carter
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
E. R. Vance
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
D. R. G. Mitchell
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
J. V. Hanna
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
Z. Zhang
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
E. Loi
Affiliation:
Australian Nuclear Science & Technology Organization, New Illawarra Road, Menai 2234, Australia
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Abstract

The dissolution in de-ionized water (DIW) at 90 and 150 °C of Cs and Ba from mechanically polished Cs-doped Ba hollandite samples is essentially congruent. The normalized Ba and Cs release rates were <0.001 g/m2/day after 56 days in DIW at 90 °C, and the Ba normalized release rate of a Cs-free sample was 0.01 g/m2/day after 56 days in DIW at 150 °C. Varying the pH between approximately 2.5 and 12.9 affected only the Ba dissolution rates of hollandite by half an order of magnitude. The dissolution rates of all species decrease with increasing leaching time due to the formation of partly impervious surface coatings of Al- and Ti-rich species. These surface coatings were investigated by scanning electron microscopy, and in some cases by cross-sectional transmission electron microscopy and x-ray photoelectron spectroscopy.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 10 , October 2002 , pp. 2578 - 2589
Copyright
Copyright © Materials Research Society 2002

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References

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