Structural integrity of Cs and Sr immobilized lacunar apatite phosphate simulated ceramic wasteform Na0.9Cs0.1Pb3Sr(PO4)3 under heat and aqueous flow

Ravikumar, R.; Gopal, Buvaneswari

doi:10.1016/j.jnucmat.2021.153388

Cited by 13 publications

(2 citation statements)

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“…Progress has been made in the understanding of iodoapatite dissolution [ 99 , 100 , 101 ], complex interactions at microscopic scales [ 102 , 103 ], interactions with other materials [ 104 , 105 ], and the prediction of the dissolution kinetics of iodoapatite using rate equations [ 1 , 106 ]. These experiments suggest the importance of complex interactions and processes involving iodoapatite dissolution such as ion exchange, diffusion, and transport through grain boundaries, in addition to dissolution.…”

Section: Modeling Of the Dissolution Kinetics Of Crystalline Ceramics...mentioning

confidence: 99%

Computational Materials Design for Ceramic Nuclear Waste Forms Using Machine Learning, First-Principles Calculations, and Kinetics Rate Theory

2023

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Ceramic waste forms are designed to immobilize radionuclides for permanent disposal in geological repositories. One of the principal criteria for the effective incorporation of waste elements is their compatibility with the host material. In terms of performance under environmental conditions, the resistance of the waste forms to degradation over long periods of time is a critical concern when they are exposed to natural environments. Due to their unique crystallographic features and behavior in nature environment as exemplified by their natural analogues, ceramic waste forms are capable of incorporating problematic nuclear waste elements while showing promising chemical durability in aqueous environments. Recent studies of apatite- and hollandite-structured waste forms demonstrated an approach that can predict the compositions of ceramic waste forms and their long-term dissolution rate by a combination of computational techniques including machine learning, first-principles thermodynamics calculations, and modeling using kinetic rate equations based on critical laboratory experiments. By integrating the predictions of elemental incorporation and degradation kinetics in a holistic framework, the approach could be promising for the design of advanced ceramic waste forms with optimized incorporation capacity and environmental degradation performance. Such an approach could provide a path for accelerated ceramic waste form development and performance prediction for problematic nuclear waste elements.

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Section: Modeling Of the Dissolution Kinetics Of Crystalline Ceramics...mentioning

confidence: 99%

Computational Materials Design for Ceramic Nuclear Waste Forms Using Machine Learning, First-Principles Calculations, and Kinetics Rate Theory

2023

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“…In addition, the use of ceramics provides a greater variety of compositions for the immobilization of different types of radionuclides. Finally, the use of powder metallurgy allows the production of denser and more homogeneous matrices with ceramics, which is critical for the long-term stability of immobilization [10][11][12][13][14][15]. Promising ceramic matrices for 90 Sr are mineral-like compounds based on titanates, zirconates, phosphates, and silicates.…”

Section: Introductionmentioning

confidence: 99%

Perovskite/Pyrochlore Composite Mineral-like Ceramic Fabrication for 90Sr/90Y Immobilization Using SPS-RS Technique

Papynov,

Shichalin,

Belov

et al. 2023

Coatings

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A novel solid-phase synthetic approach was developed to produce a mineral-like composite ceramic based on strontium titanate (SrTiO3) and yttrium titanate (Y2Ti2O7) matrices for immobilizing radionuclides such as 90Sr and its daughter product 90Y, as well as lanthanides and actinides, via reactive spark plasma sintering technology (SPS-RS). Using XRD, SEM, and EDS analyses, the sintering kinetics of the initial mixed oxide reactants of composition YxSr1–1.5xTiO3 (x = 0.2, 0.4, 0.6 and 1) and structure-phase changes in the ceramics under SPS-RS conditions were investigated as a function of Y3+ content. In addition, a detailed study of phase transformation kinetics over time as a function of the heating temperature of the initial components (SrCO3, TiO2, and Y2O3) was conducted via in situ synchrotron XRD heating experiments. The composite ceramic achieved relatively high physicomechanical properties, including relative density between 4.92–4.64 g/cm3, Vickers microhardness of 500–800 HV, and compressive strength ranging from 95.5–272.4 MPa. An evaluation of hydrolytic stability and leaching rates of Sr2+ and Y3+ from the matrices was performed, demonstrating rates did not exceed 10−5–10−6 g·cm−2·day−1 in compliance with GOST R 50926-96 and ANSI/ANS 16.1 standards. The leaching mechanism of these components was studied, including the calculation of solution penetration depth in the ceramic bulk and ion diffusion coefficients in the solution. These findings show great promise for radioactive waste conditioning technologies and the manufacturing of radioisotope products.

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Microwave sintering for rapid treatment of simulated Nd3+ and Sr2+ radioactive contaminated soil: exploring the influence of Nd:Sr mass ratio and mechanism

Mao,

Xu,

Liao

et al. 2024

J Radioanal Nucl Chem

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Structural integrity of Cs and Sr immobilized lacunar apatite phosphate simulated ceramic wasteform Na0.9Cs0.1Pb3Sr(PO4)3 under heat and aqueous flow

Cited by 13 publications

References 56 publications

Computational Materials Design for Ceramic Nuclear Waste Forms Using Machine Learning, First-Principles Calculations, and Kinetics Rate Theory

Computational Materials Design for Ceramic Nuclear Waste Forms Using Machine Learning, First-Principles Calculations, and Kinetics Rate Theory

Perovskite/Pyrochlore Composite Mineral-like Ceramic Fabrication for 90Sr/90Y Immobilization Using SPS-RS Technique

Microwave sintering for rapid treatment of simulated Nd3+ and Sr2+ radioactive contaminated soil: exploring the influence of Nd:Sr mass ratio and mechanism

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