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Accommodation of Uranium into the Garnet Structure

Published online by Cambridge University Press:  21 March 2011

Sergey V. Yudintsev ,
Marya I. Lapina ,
Alexander G. Ptashkin ,
Tatiana S. Ioudintseva ,
Satoshi Utsunomiya ,
Lumin M. Wang  and
Rodney C. Ewing
Sergey V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny 35, 109017 Moscow, Russia
Marya I. Lapina
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny 35, 109017 Moscow, Russia
Alexander G. Ptashkin
Affiliation:
SIA [Radon”, Rostovsky 2/14, 119121 Moscow, Russia
Tatiana S. Ioudintseva
Affiliation:
Moscow State University, Vorob'evy Gory, 119899 Moscow, Russia
Satoshi Utsunomiya
Affiliation:
The University of Michigan, Ann Arbor, MI, 48109-2104, U.S.A.
Lumin M. Wang
Affiliation:
The University of Michigan, Ann Arbor, MI, 48109-2104, U.S.A.
Rodney C. Ewing
Affiliation:
The University of Michigan, Ann Arbor, MI, 48109-2104, U.S.A.
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Abstract

One promising host for actinide wastes is garnet-type phases of general formula AVIII3BVI 2[XO4]3. To determine the isomorphic capacity of garnet for uranium, the CaO – Fe2O3 – Al2O3 – SiO2 – ZrO2 – Gd2O3 – UO2 system was studied. Experiments were performed in air medium at 1400 – 1500 °C and 1 atm. The garnets have high capacity for Gd and Zr, while incorporation of U was found to be greatly dependent on the phase composition. Uranium content decreased from 18 wt.% in Ca-Zr-Fe garnet to 0.6 wt.% in Si-doped phases. Heavy ion irradiation (1.0 MeV Kr++) experiments were carried out for a garnet with maximal U content, (Ca2.7U0.3)VIII(Zr1.7Fe0.3)VI(Al1.1Fe1.9)IVO12. Amorphization dose of the phase was equal to 1.63×1014 ions/cm2 that is close to the other actinide hosts, such as pyrochlore Gd2Ti2O7.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ11.28
Copyright
Copyright © Materials Research Society 2002

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References

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