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Phase Relations and Chemical Durability of Ceramics in the Pseudo-Binary System: CaZrTi2O7–GdAlO3

Published online by Cambridge University Press:  01 February 2011

N. P. Mikhailenko ,
A. V. Ochkin ,
S. V. Stefanovsky  and
O. I. Kirjanova
N. P. Mikhailenko
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
A. V. Ochkin
Affiliation:
D. Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow 125047, RUSSIA
S. V. Stefanovsky
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, RUSSIA
O. I. Kirjanova
Affiliation:
SIA Radon, 7th Rostovskii per. 2/14, Moscow 119121, RUSSIA
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Abstract

Phase relations in a pseudo-binary system (1-x) CaZrTi2O7- x GdAlO3 suggested for immobilization of a zirconium - rare earth – actinide fraction of high level waste were studied with X-ray diffraction and electron microscopy. Zirconolite and perovskite were found to be major phases in the ceramic samples prepared by cold pressing and sintering at 1400 and 1500 °C. At relatively low perovskite content (x < 0.5) zirconolite is the major host for Gd, which is considered as a trivalent surrogate for Am and Cm. At higher perovskite content, perovskite becomes the major host for Gd. Zirconolite is the major host phase for corrosion products (Al, Fe, Ti, Zr). Leach rates of Gd, 238Pu, and 241Am from the ceramics studied are 10−4–10−5 g/(m2d).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 807: Symposium Scientific Basis for Nuclear Waste Management XXVII , 2003 , 327
Copyright
Copyright © Materials Research Society 2004

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References

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