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Rare Earth-Bearing Murataite Ceramics

Published online by Cambridge University Press:  19 October 2011

Sergey Stefanovsky ,
Sergey Yudintsev ,
Boris Nikonov  and
Olga Stefanovsky
Sergey Stefanovsky
Affiliation:
[email protected], SIA Radon, Center of Advanced Technologies, 7th Rostovskii lane 2/14, Moscow, 119121, Russian Federation, 7 495 919 3194, 7 495 259 3739
Sergey Yudintsev
Affiliation:
[email protected], IGEM RAS, Moscow, 119017, Russian Federation
Boris Nikonov
Affiliation:
[email protected], IGEM RAS, Moscow, 119017, Russian Federation
Olga Stefanovsky
Affiliation:
[email protected], SIA Radon, Moscow, 119121, Russian Federation
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Abstract

Phase composition of the murataite-based ceramics containing 10 wt.% lanthanum, cerium, neodymium, europium, gadolinium, yttrium, zirconium oxides was studied. The ceramics were prepared by melting of oxide mixtures in glass-carbon ampoules in air at ∼1500° C. They are composed of predominant murataite-type phases and minor extra phases: rutile, crichtonite, perovskite, ilmenite/pyrophanite, and zirconolite (in the Zr-bearing sample only). Three murataite-related phases with five- (5C), eight- (8C), and three-fold (3C) elementary fluorite unit cell are normally present in all the ceramics. These phases form core, intermediate zone, and rim of the murataite grains, respectively. They are predominant host phases for the rare earth elements whose concentrations are reduced in a row: M-5C>M-8C>M-3C. Appreciate fraction of La and Ce may enter the perovskite phase.

Keywords

x-ray diffraction (XRD)ceramicscanning electron microscopy (SEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 985: Symposium NN – Scientific Basis for Nuclear Waste Management XXX , 2006 , 0985-NN04-10
Copyright
Copyright © Materials Research Society 2007

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References

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