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Surface Alteration of Nd-Bearing Zirconolite Following Hydrothermal Treatment

Published online by Cambridge University Press:  21 March 2011

Zhaoming Zhang ,
Eric R. Vance  and
Mark G. Blackford
Zhaoming Zhang
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, AustraliaEmail: [email protected]
Eric R. Vance
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, AustraliaEmail: [email protected]
Mark G. Blackford
Affiliation:
Materials Division, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, AustraliaEmail: [email protected]
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Abstract

Static dissolution tests on Nd-bearing zirconolite were conducted in deionized water at 150°C for up to 6 months. Surfaces, both before and after aqueous dissolutions, were examined using X-ray Photoelectron Spectroscopy (XPS) and Scanning Electron Microscopy (SEM). Individual submicron-sized crystals wereobserved only on some zirconolite grains after hydrothermal treatment for one week, and were identified as brookite (possibly plus anatase) by Transmission Electron Microscopy (TEM). The number of secondary crystals present on the zirconolite surface was, however, reduced significantly after 6 months of durability testing. The results of electron microscopy studies are consistent with those obtained from XPS in that the average Ca and Ti concentrations of the top surface layer (< 5 nm) decreased slightly with respect to Zr, while the average Al concentration increased after durability testing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 285
Copyright
Copyright © Materials Research Society 2001

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