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Effect of Synthesis Conditions and Actinide Contents on Phase Composition of Actinide Bearing Ceramics

Published online by Cambridge University Press:  01 February 2011

A. G. Ptashkin ,
S. V. Stefanovsky ,
S. V. Yudintsev  and
S. A. Perevalov
A. G. Ptashkin
Affiliation:
SIA Radon, 7th Rostovskii per., 2/14, Moscow 119121, RUSSIA
S. V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii per., 2/14, Moscow 119121, RUSSIA
S. V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetnii per. 35, Moscow 109017, RUSSIA
S. A. Perevalov
Affiliation:
Vernadsky Institute of Geochemistry and Analytical Chemistry, Kosygin st., 19, Moscow, RUSSIA
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Abstract

Pu-bearing zirconolite and pyrochlore based ceramics were prepared by melting under oxidizing and reducing conditions at 1550 °C. 239Pu content in the samples ranged between ∼10 and ∼50 wt.%. Phase composition of the ceramics and Pu partitioning were studied using X-ray diffraction (XRD) and scanning electron microscopy with energy dispersive system (SEM/EDS). Major phases in the samples were found to be the target zirconolite and pyrochlore as well as a cubic fluorite structure oxide. Normally the Pu content in the Pu host phases was 10–12 wt.%. This corresponds to the Pu content recommended for matrices for immobilization of excess weapons plutonium. At higher Pu content (up to 50 wt.%) additional phases, such as a PuO2-based cubic fluorite-structured solid solution, perovskite, and rutile were found.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 345
Copyright
Copyright © Materials Research Society 2004

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References

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