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Murataite-based ceramics for actinide waste immobilization

Published online by Cambridge University Press:  10 February 2011

S. V. Stefanovsky,
S. V. Yudintse,
B. S. Nikonov,
B. I. Omelianenko and
A. G. Ptashkin
S. V. Stefanovsky
Affiliation:
* SIA “Radon”, 7-th Rostovskii per., 2/14, Moscow 119121, Russia, itbstef@cityline.ru.
S. V. Yudintse
Affiliation:
Institute of Geology of Ore Deposits (IGEM RAS), Staromonetny per., 35, Moscow 1091017, Russia, sergey@gigem.msk.su.
B. S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits (IGEM RAS), Staromonetny per., 35, Moscow 1091017, Russia, sergey@gigem.msk.su.
B. I. Omelianenko
Affiliation:
Institute of Geology of Ore Deposits (IGEM RAS), Staromonetny per., 35, Moscow 1091017, Russia, sergey@gigem.msk.su.
A. G. Ptashkin
Affiliation:
D.Mendeleev University of Chemical Technology, Miusskaya sq. 9, Moscow, Russia
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Abstract

Studying the Synroc, doped with a simulated HLW, we have found, along with conventional Synroc phases (zirconolite, perovskite, hollandite), an extra phase with a stoichiornetry (Ca, Mn, U, TR)4(U, TR, Zr, Ti) 2(AI, Ti)7O22. XRD and TEM study has shown this phase is related to a very rare mineral murataite. In the present work a ceramic based on murataite is studied. The ceramic samples in the system: Ca-Mn-Ti-Zr-U-Ce-AI-Fe-O were produced and examined in details using XRD, SEM/EDS, TEM, and optical microscopy. Total amount of actinide (U) and rare earth (Ce, Gd) elements in the murataite exceeds 20 wt%. Isomorphic substitution schemes in the structures of synthetic and natural murataites are discussed. High isomorphic capacity of the murataite structure towards actinides and REEs, flexibility of its composition, feasibility of synthesis by melting, including a cold crucible melting, and very high chemical durability under hydrothermal conditions make the murataite-based ceramics very promising for actinides and excess weapon Pu fixation.

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References

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