Immobilization of Cs and Sr within perovskite-type Ba0.7-Sr (La, Cs)0.3ZrO3 glass/ceramic composite waste forms

Liu, Haifeng; Wang, Hua; Zhao, Jian; Li, Jie; Zhang, Xingquan; Yang, Jiacheng; Zhu, Yongchang; Xie, Ruishi; Zheng, Kui; Huang, Heyan; Huo, Jichuan

doi:10.1016/j.ceramint.2022.08.007

Cited by 10 publications

(1 citation statement)

References 28 publications

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“…It bears noting that perovskites have seen extensive and active investigation as matrices for radionuclide isolation [9][10][11]. The presence of perovskite structures in natural minerals stable over wide geochemical conditions for millions of years indicates the high hydrothermal stability of such compounds.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Sol–Gel and Spark Plasma Sintering to Produce Perovskite-like SrTiO3 Ceramics for Radioactive Waste Isolation

Belov,

Shichalin,

Papynov

et al. 2023

J. Compos. Sci.

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The paper presents a reliable technology combining sol–gel synthesis and spark plasma sintering (SPS) to obtain SrTiO3 perovskite-type ceramics with excellent physicomechanical properties and hydrolytic stability for the long-term retention of radioactive strontium radionuclides. The Pechini sol–gel method was used to synthesize SrTiO3 powder from Sr(NO3)2 and TiCl3 (15%) precursors. Ceramic matrix samples were fabricated by SPS in the temperature range of 900–1200 °C. The perovskite structure of the synthesized initial SrTiO3 powder was confirmed by X-ray diffraction and thermal analysis results. Scanning electron microscopy revealed agglomeration of the nanoparticles and a pronounced tendency for densification in the sintered compact with increasing sintering temperature. Chemical homogeneity of ceramics was confirmed by energy dispersive X-ray analysis. Physicochemical characteristic studies included density measurement results (3.11–4.80 g·cm−3), dilatometric dependencies, Vickers microhardness (20–900 HV), and hydrolytic stability (10−6–10−7 g·cm−2·day−2), exceeding GOST R 50926-96 and ISO 6961:1982 requirements for solid-state matrices. Ceramic sintered at 1200 °C demonstrated the lowest strontium leaching rate of 10−7 g/cm2·day, optimal for radioactive waste (RAW) isolation. The proposed approach can be used to fabricate mineral-like forms suitable for RAW handling.

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Section: Introductionmentioning

confidence: 99%