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Corrosion Resistance of the Nd–Ti Matrix for Actinides

  • GEOECOLOGY
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Abstract

Leaching of Np and Pu in water from samples composed of two titanate phases Nd2Ti3O9 (75 wt %) and Nd2Ti2O7 (25 wt %) is investigated. The rates of leaching actinides decrease with time at T = 90°C and are equal to 10–8 g/(cm2 day) for Pu and 7 × 10–7 g/(cm2 day) for Np on the 28th day of the experiment. The higher value of neptunium is likely related to its existence in the samples in valence states IV and V, while plutonium is in states III and IV. It is shown that the acidity of the solution has a significant effect on the leaching rate. Under near-neutral conditions typical of deep repositories, matrices for actinide immobilization based on REE titanates can be considered as corrosion resistant. The causes of the formation of a perovskite-like phase with Nd2Ti3O9 composition are discussed. They can be related to both the high temperature and the reducing conditions of the synthesis process.

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ACKNOWLEDGMENTS

We are grateful to B.E. Burakov for his comments that allowed us to refine this work.

Funding

This work was carried out under a State Assignment of the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry on the subject of the research work. The structural study of the phases was supported by the Ministry of Education and Science of the Russian Federation, grant no. 075-15-2020-782.

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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. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    S. S. Danilov

  3. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 119991, Moscow, Russia

    A. A. Shiryaev

  4. Leading Research Institute of Chemical Technology, Rosatom State Corporation, 111524, Moscow, Russia

    I. M. Melnikova

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  1. S. V. Yudintsev
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  2. S. S. Danilov
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  3. A. A. Shiryaev
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  4. I. M. Melnikova
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Correspondence to S. V. Yudintsev.

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Translated by L. Mukhortova

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Yudintsev, S.V., Danilov, S.S., Shiryaev, A.A. et al. Corrosion Resistance of the Nd–Ti Matrix for Actinides. Dokl. Earth Sc. 505, 512–516 (2022). https://doi.org/10.1134/S1028334X22070194

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