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Murataite Ceramics Doped with Lanthanides and Uranium

Published online by Cambridge University Press:  26 February 2011

Sergey Stefanovsky ,
S.V. Yudintsev ,
B.S. Nikonov  and
O.I. Stefanovsky
Sergey Stefanovsky
Affiliation:
[email protected], SIA Radon, Center of Advanced Technologies, 7th Rostovskii lane 2/14, Moscow, Russia, 119121, Russian Federation, 7 (095) 259 3739, 7 (095) 919 3194
S.V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii lane 35, Moscow 119017Russia
B.S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits RAS, Staromonetnii lane 35, Moscow 119017Russia
O.I. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii lane 2/14, Moscow 119121Russia
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Abstract

Phase composition of the murataite-based ceramics containing 10 wt.% of mixed oxides simulating rare earth/actinide (REE/An) and actinide (An) fractions of high level waste (HLW) was studied. The ceramics were prepared by melting of oxide mixtures in Pt ampoules in air at ∼1500 °C. Ceramics with REE/An and An fractions surrogates are composed of predominant murataite-type phases and minor extra phases: perovskite and crichtonite. Three murataite-related phases with five- (5C), eight- (8C), and three-fold (3C) elementary fluorite unit cell are present in these ceramics. These phases form core, intermediate zone, and rim of the murataite grains, respectively. They are predominant host phases for the rare earth elements and uranium whose concentrations are reduced in a row: M-5C>M-8C>M-3C. Appreciate fraction of Ce, Nd, and Pu may enter the perovskite phase. In the An-Gd ceramic perovskite and murataite were found to be predominant and secondary in abundance phases respectively.

Keywords

ceramiclanthanideU
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 893: Symposium JJ – Actinides 2005 – Basic Science, Applications and Technology , 2005 , 0893-JJ05-10
Copyright
Copyright © Materials Research Society 2006

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References

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