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Leaching of americium-241, plutonium-238 and matrix elements from perovskite-based ceramics

Published online by Cambridge University Press:  11 February 2011

A. V. Ochkin ,
S. V. Chizhevskaya ,
N. E. Archakova ,
A. O. Merkushkin ,
I. A. Petukhova ,
N. P. Mikhailenko  and
S. V. Stefanovsky
A. V. Ochkin
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
S. V. Chizhevskaya
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
N. E. Archakova
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
A. O. Merkushkin
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
I. A. Petukhova
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
N. P. Mikhailenko
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, RUSSIA, profstef@radon.ru
S. V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, RUSSIA, profstef@radon.ru
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Abstract

Perovskite-based ceramics ABO3 (A = La or Gd; B = Al or Fe) and a pseudobinary system: LaAlO3 + CaZrTi2O7 are promising matrices for immobilization of actinide fraction of HLW. The ceramic samples containing 241Am, 238Pu or 147Pm were prepared by cold pressing in pellets at 100–300 MPa and sintering at 1300–1500 °C. Leach rates of radionuclides and matrix elements (La, Gd, Al and Fe) from powders were measured using Soxhlet unit. Sintered ceramics in the series: LaAl1-xFexO3 were composed of perovskite phase. Ceramics in the compositional series xLaAlO3 + CaZrTi2O7 (0.4 ≤ x ≤ 6) consisted of perovskite, zirconolite, and baddeleyite at x = 0.4 and x = 0.7, and perovskite and baddeleyite at higher x values. Leach rate of radionuclides and matrix elements from all the ceramics were lower than 10-8 g·cm-2·day.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 757: Symposium II – Scientific Basis for Nuclear Waste Management XXVI , 2002 , II3.21
Copyright
Copyright © Materials Research Society 2003

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References

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