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Sintered (Sr,U)-Containing Zirconolite Ceramics Study

Published online by Cambridge University Press:  10 February 2011

S.V. Stefanovsky ,
S.V. Ioudintsev ,
A.V. Ochkin ,
A.G. Ptashkin  and
S.V. Chizhevskaya
S.V. Stefanovsky
Affiliation:
SIA «RADON», 7th Rostovskii per., 2/14, Moscow 119121Russia
S.V. Ioudintsev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetnii 35, Moscow 109017Russia
A.V. Ochkin
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
A.G. Ptashkin
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
S.V. Chizhevskaya
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
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Abstract

Zirconolite-rich ceramics, containing strontium (∼1 wt.%) or uranium (5-20 wt.%) were prepared by cold pressing of mechanically activated oxide powders and sintering in air at 1200 TC for 2 hours. They were examined with XRD, optical and electron microscopy (SEM/TEM/EDS) methods. Zirconolite content in the samples was found to be as much as 85-90 vol.%, Baddeleyite, rutile, and perovskite (in the Sr-containing sample only) were present as minor phases. In the U-containing samples, two zirconolite varieties with different Zr/U ratio were found: zirconolite-1 and zirconolite-2 with average compositions Ca0.90Zr0.95U0.10Ti2.00O7.00, and Ca1.15Zr0.40U0.50Ti2.02O7.00 respectively. The amount of zirconolite-2 increases from ∼1 vol.% in the sample with the lowest uranium content to >50 vol.% in the sample containing ∼20 % U02. In the latter sample about 5 vol.% of cubic pyrochlore-type phase was also present.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 506: Symposium – Scientific Basis for Nuclear Waste Management XXI , 1997 , 261
Copyright
Copyright © Materials Research Society 1998

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References

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