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Ceramic Composite Matrices Based on the LaPO4–ZrO2 System: Preparation and Properties

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Abstract

The original approach to the use of ceramic composites as matrices for the solidification and disposal of the actinide-rare earth fraction of high-level radioactive waste (HLW ) is considered. Ceramic composites are prepared by sintering nanosized powders of (1 – x)LaPO4–xZrO2 precalcined at 850°C using unstabilized zirconium oxide. The calcined powders are subjected to stepwise sintering in the temperature range 1000–1300°C and at 1600°C to obtain ceramic composite matrices (1 – x)LaPO4–xZrO2. Experiments on the leaching of ceramic samples sintered at a temperature of 1600°C are carried out. The rates of leaching of La3+ and Zr4+ ions from ceramic samples in distilled water are calculated; the results are compared with the previously obtained data for similar matrices in a concentrated solution of sodium chloride and sulfate. The results of the study of ceramic matrices before and after leaching by the XRD and electron microscopy methods are presented.

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Funding

This study was financially supported by the Institute of Silicate Chemistry of the Russian Academy of Sciences with the support of the RF Ministry of Science and Higher Education (project no. AAAA-A19-119022290092-5).

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Authors and Affiliations

  1. Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    L. P. Mezentseva, A. V. Osipov, V. L. Ugolkov & L.A. Koptelova

  2. St. Petersburg State Institute of Technology, 190013, St. Petersburg, Russia

    A. A. Akatov

Authors
  1. L. P. Mezentseva
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  2. A. V. Osipov
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  3. V. L. Ugolkov
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  4. A. A. Akatov
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  5. L.A. Koptelova
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Correspondence to L. P. Mezentseva.

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Mezentseva, L.P., Osipov, A.V., Ugolkov, V.L. et al. Ceramic Composite Matrices Based on the LaPO4–ZrO2 System: Preparation and Properties. Glass Phys Chem 47, 665–670 (2021). https://doi.org/10.1134/S1087659621060213

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  • DOI: https://doi.org/10.1134/S1087659621060213

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