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Effect of Synthesis Conditions on Phase Composition of Pyrochlore-Brannerite Ceramics

Published online by Cambridge University Press:  21 March 2011

S.V. Stefanovsky ,
S.V. Yudintsev ,
B.S. Nikonov ,
M.I. Lapina  and
A.S. Aloy
S.V. Stefanovsky
Affiliation:
SIA “Radon”, 7th Rostovskii per., 2/14, Moscow 119121Russia, Email: itbstef@cityline.ru
S.V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
B.S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
M.I. Lapina
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii 35, Moscow 109035, Russia
A.S. Aloy
Affiliation:
V.G. Khlopin Radium Institute, 2nd Murinskii pr. St-Petersburg, Russia
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Abstract

Three melted samples of pyrochlore-brannerite-based ceramics produced under different redox conditions were examined. Two of the samples were produced using cold crucible melting at ~1600 C. The third sample was obtained via melting in a microwave oven at 1700-1800 C. All the samples are composed of major pyrochlore and brannerite phases, and minor rutile and UO2-based solid solution or pseudobrookite phases. Pyrochlore-structured phases predominate in all three samples and account for 50-60% of the total bulk. Two pyrochlore varieties – Ca-pyrochlore (predominant) and Ba-pyrochlore have been found in these samples. The latter phase is more stable at high temperatures than the Ba-hollandite present in sintered pyrochlore-rich Synroc-F ceramics. Decomposition of the Ba-hollandite results in rutile formation in the melted samples.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 315
Copyright
Copyright © Materials Research Society 2001

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References

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