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Formation of Perovskite and Calzirtite During Zirconolite Alteration

Published online by Cambridge University Press:  10 February 2011

J. Malmström ,
E. Reusser ,
R. Giere ,
G.R. Lumpkin ,
M.G Blackford ,
M. Düggelin ,
D. Mathys ,
R. Guggenheim  and
D. Günther
J. Malmström
Affiliation:
Institute of Mineralogy and Petrography, ETH-Zentrum, 8092 Zirich, Switzerland (malmi@erdw.ethz.ch)
E. Reusser
Affiliation:
Institute of Mineralogy and Petrography, ETH-Zentrum, 8092 Zirich, Switzerland (malmi@erdw.ethz.ch)
R. Giere
Affiliation:
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, IN 47907-1397, USA
G.R. Lumpkin
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia
M.G Blackford
Affiliation:
Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia
M. Düggelin
Affiliation:
SEM-Laboratory, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland
D. Mathys
Affiliation:
SEM-Laboratory, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland
R. Guggenheim
Affiliation:
SEM-Laboratory, University of Basel, Bernoullistrasse 32, 4056 Basel, Switzerland
D. Günther
Affiliation:
Institute of Inorganic Chemistry, ETH-Zentrum, 8092 Zürich, Switzerland
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Abstract

Synthetic zirconolites doped with rare earth elements (REEs) are corroded in a closed system at elevated temperature and pressure for various fluid compositions. Together with previous studies, the results indicate only a weak corrosion below 250°C at 50 MPa. Above that temperature and up to 500°C zirconolite (CaZrT2O7) displays more rapid rates of corrosion and may be covered by various secondary phases, depending on the fluid composition. Above 500°C in Na-rich fluids, zirconolite is replaced by perovskite (CaTiO3) and calzirtite (Ca2Zr5Ti2O16), but the REEs and Hf (as actinide analogues and/or neutron absorbers) are incorporated into the secondary phases. Perovskite and calzirtite exhibit an unusual crystal chemistry as determined by transmission electron microscopy and microanalysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 475
Copyright
Copyright © Materials Research Society 2000

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References

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