Aqueous dissolution of perovskite (CaTiO3): Effects of surface damage and [Ca2+] in the leachant

Zhang, Z. M. and Blackford, M. G. and Lumpkin, G. R. and Smith, K. L. and Vance, E. R. (2005) Aqueous dissolution of perovskite (CaTiO3): Effects of surface damage and [Ca2+] in the leachant. Journal of Materials Research, 20 (9). pp. 2462-2473. DOI

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We have characterized thermally annealed perovskite (CaTiO 3 ) 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 CaTiO 3 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 (TiO 2 ) by both x-ray and electron diffraction, on CaTiO 3 surfaces after dissolution testing at 150 °C. The effect of Ca 2+ 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 Ca 2+ is present in ground water.

Item Type: Article
Uncontrolled Keywords: 2005 AREP 2005 P IA49
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Materials Research
Volume: 20
Page Range: pp. 2462-2473
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 05 Aug 2010 14:35
Last Modified: 23 Jul 2013 10:00

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