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Perovskite Ceramics from Mechanically Activated Batches for Immobilization of Rare Earth– Actinide Fraction of HLW

Published online by Cambridge University Press:  21 March 2011

S.V. Chizhevskaya ,
N.E. Cherniavskaya ,
A.V. Ochkin ,
A.M. Chekmarev  and
S.V. Stefanovsky
S.V. Chizhevskaya
Affiliation:
D.Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
N.E. Cherniavskaya
Affiliation:
SIA Radon, 7th Rostovskii per., 2/14, Moscow 119121, Russia,Email: itbstef@cityline.ru
A.V. Ochkin
Affiliation:
D.Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
A.M. Chekmarev
Affiliation:
D.Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
S.V. Stefanovsky
Affiliation:
D.Mendeleev University of Chemical Technology, Miusskaya 9, Moscow, Russia
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Abstract

The effects of different methods of grinding or mechanical milling of precursor mixtures were determined for the structure and properties of perovskite ceramics with the formulation Ca1-xGdxTi1-xAlxO3 (0 ≤x ≤ 1). The ceramics were prepared by coldpressing finely ground precursor mixtures at 100-300 MPa to form pellets that were then sintered at 1300-1500oC. Ceramic samples prepared from precursor material batches treated in a ball or planetary mill or ground in a mortar contained unreacted oxides and had low mechanical integrity and chemical durability. The ceramics produced from precursor material treated by high performance mechanical milling using a high speed rotating vortex layer of ferromagnetic bodies were composed of a major perovskite-structured phase (90-95%) with a Ca-Ti-Gd-Al-O composition and a minor pyrochlore-structured phase with a composition close to that of gadolinium titanate; these ceramics had the highest bending strength (200-340 MPa) and density (~90% of theoretical) and the lowest leach rates for uranium, plutonium, and americium among all the samples studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 663: Symposium – Scientific Basis for Nuclear Waste management XXIV , 2000 , 367
Copyright
Copyright © Materials Research Society 2001

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References

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