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Aqueous Dissolution of Perovskite (CaTiO3): Effects of Surface Damage and [Ca2+] in the Leachant

Published online by Cambridge University Press:  03 March 2011

Zhaoming Zhang ,
Mark G. Blackford ,
Gregory R. Lumpkin ,
Katherine L. Smith  and
Eric R. Vance
Zhaoming Zhang*
Affiliation:
Australian Nuclear Science & Technology Organisation, Lucas Heights, NSW 2234, Australia
Mark G. Blackford
Affiliation:
Australian Nuclear Science & Technology Organisation, Lucas Heights, NSW 2234, Australia
Gregory R. Lumpkin
Affiliation:
Australian Nuclear Science & Technology Organisation, Lucas Heights, NSW 2234, Australia; and Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, United Kingdom
Katherine L. Smith
Affiliation:
Australian Nuclear Science & Technology Organisation, Lucas Heights, NSW 2234, Australia
Eric R. Vance
Affiliation:
Australian Nuclear Science & Technology Organisation, Lucas Heights, NSW 2234, Australia
*
a) Address all correspondence to this author. e-mail: zzx@ansto.gov.au
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Abstract

We have characterized thermally annealed perovskite (CaTiO3) surfaces, both before and after aqueous dissolution testing, using scanning electron microscopy, cross-sectional transmission electron microscopy, x-ray photoelectron spectroscopy, and atomic force microscopy. It was shown that mechanical damage caused by polishing was essentially removed at the CaTiO3 surface by subsequent annealing; such annealed samples were used to study the intrinsic dissolution behavior of perovskite in deionized water at RT, 90 °C, and 150 °C. Our results indicate that, although mechanical damage caused higher Ca release initially, it did not affect the long-term Ca dissolution rate. However, the removal of surface damage by annealing did lead to the subsequent spatial ordering of the alteration product, which was identified as anatase (TiO2) by both x-ray and electron diffraction, on CaTiO3 surfaces after dissolution testing at150 °C. The effect of Ca2+ in the leachant on the dissolution reaction of perovskite at 150 °C was also investigated, and the results suggest that under repository conditions, the release of Ca from perovskite is likely to be significantly slower if Ca2+ is present in ground water.

Keywords

CeramicCorrosion
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2462 - 2473
Copyright
Copyright © Materials Research Society 2005

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