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Synthesis and Study of Neodyme–Titanate Ceramic with Curium

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Abstract

The properties of the potential matrix of the REE–actinide fraction of high-level radioactive waste have been studied. A sample containing 2 wt % of curium was obtained by sintering at 1400°С from a charge with the (Nd,Cm)4Ti9O24 composition. The sample was studied by the conventional XRD method. Its stability in water was determined according to the standard procedure (90°C, periodic change of solution). Contrary to the preliminary experiments with Sm (a Cm imitation) the sample consisted of perovskite-like Nd0.667TiO3 titanate and a small amount of Ti3O5 instead of the (Nd,Cm)4Ti9O24 titanate phase. The reason for the discrepancy is probably associated with the reducing conditions during the synthesis of the curium-containing sample, which led to the formation of (Nd,Cm)0.667TiO3 and Ti3O5 instead of the expected phase (Nd,Cm)4Ti9O24. From the change in the X-ray diffraction patterns over time and from the data of leaching experiments, the radiation resistance of the sample and its corrosion resistance (leaching rates of elements) in water were determined.

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ACKNOWLEDGMENTS

We are grateful to the reviewers for their comments, which improved the manuscript.

Funding

The work was carried out within the framework of a State Assignment of the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, and with the support of the Russian Foundation for Basic Research, project no. 18-29-12032.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    S. V. Yudintsev

  2. State Research Center, Research Institute of Atomic Reactors, 433510, Dimitrovgrad, Ulyanovsk oblast, Russia

    A. A. Lizin & S. V. Tomilin

Authors
  1. S. V. Yudintsev
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  2. A. A. Lizin
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  3. S. V. Tomilin
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Corresponding author

Correspondence to S. V. Yudintsev.

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The authors declare that they have no conflicts of interest.

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Translated by M.S. Nickolsky

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Yudintsev, S.V., Lizin, A.A. & Tomilin, S.V. Synthesis and Study of Neodyme–Titanate Ceramic with Curium. Dokl. Earth Sc. 503, 129–133 (2022). https://doi.org/10.1134/S1028334X2203014X

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