Synthesis of La2Ti2O7 nanoscale powder and ceramics based on it by sol-gel and spark plasma sintering

O. O. Shichalin; Шичалин O. O.; E. K. Papynov; Папынов E. K.; A. A. Belov; Белов A. A.; K. A. Pervakov; Перваков К. А.; S. S. Gribanova; Грибанова С. С.; S. M. Pisarev; Писарев С. М.; A. N. Fedorets; Федорец А. Н.; A. V. Pogodaev; Погодаев А. В.; A. O. Lembikov; Лембиков А. О.; Y. G. Zernov; Зернов Я. Г.; P. A. Marmaza; Мармаза П. А.; O. V. Kapustina; Капустина О. В.; Е. A. Gridasova; Гридасова Е. А.; I. Yu. Buravlev; Буравлев И. Ю.

doi:10.31857/S0044457X24040198

Synthesis of La2Ti2O7 nanoscale powder and ceramics based on it by sol-gel and spark plasma sintering

Authors: Shichalin O.O.¹, Papynov E.K.¹, Belov A.A.¹, Pervakov K.A.¹, Gribanova S.S.¹, Pisarev S.M.¹, Fedorets A.N.¹, Pogodaev A.V.¹, Lembikov A.O.¹, Zernov Y.G.¹, Marmaza P.A.¹, Kapustina O.V.¹, Gridasova Е.A.¹, Buravlev I.Y.¹
Affiliations:
1. Far Eastern Federal University
Issue: Vol 69, No 4 (2024)
Pages: 649-656
Section: НЕОРГАНИЧЕСКИЕ МАТЕРИАЛЫ И НАНОМАТЕРИАЛЫ
URL: https://rjonco.com/0044-457X/article/view/666590
DOI: https://doi.org/10.31857/S0044457X24040198
EDN: https://elibrary.ru/ZWWKGM
ID: 666590

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Abstract

The application of ceramics as matrices for the immobilization of radionuclides for the purpose of their safe long-term disposal or beneficial use is being studied with an emphasis on phase stability, structural integrity, hydrolytic stability, etc. In this work, a combined approach was investigated, based on the sol-gel citrate synthesis of nanosized La₂Ti₂O₇ powder and its subsequent spark plasma sintering to produce dense ceramics. The phase composition and structure of the nanosized La₂Ti₂O₇ powder and ceramic samples based on it, obtained in the temperature range of 900–1300 °C, were studied by XRD and SEM. It has been shown that the powder synthesis conditions ensure the formation of nanosized crystalline La₂Ti₂O₇ grains, whose consolidation under spark plasma heating conditions proceeds with a change in the phase composition from single-phase La₂Ti₂O₇ of monoclinic structure to orthorhombic with an admixture of LaTiO₃ at temperatures above 1200 °C. It was revealed that the change in the ceramic structure is accompanied by the formation of non-porous and defect-free monolithic samples. It was determined that such a change leads to an increase in relative density (81.3–95.7%) and compressive strength (78–566 MPa) of the ceramic samples. However, the hydrolytic stability of the ceramics decreases, as indicated by an increase in the leaching rate of La³⁺ from 10^–7 to 10^–5 g/cm²·day. The obtained results are useful for the systematic study of materials suitable for immobilization technologies of radioactive waste in ceramics.

Keywords

ceramics, radionuclides, radioactive waste management, sol-gel synthesis, SPS

References

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Synthesis of La2Ti2O7 nanoscale powder and ceramics based on it by sol-gel and spark plasma sintering

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Abstract

Keywords

About the authors

References

Supplementary files