模拟镧系元素固化的掺La<sub>2</sub>O<sub>3</sub>玄武岩玻璃的结构与性能研究

doi:10.11896/cldb.21110089

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Abstract The La₂O₃-doped basaltic glass was prepared by the solid-state melt method, which the La element is used to simulate the nuclide U in high-level radioactive waste (HLW). The structure, thermal stability and leaching resistance of basaltic glass with different content of La₂O₃ were studied. XRD and SEM results show that all the samples are glassy until the content of La₂O₃ up to 12wt%. Raman results indicate that the addition of La₂O₃ breaks the Si-O-Si bond of large-membered and four-membered in basaltic glass, but more Al³⁺ participated in the network connection, resulting in the improvement of the polymerization degree of glass network. DSC results show the rigidity and the thermal stability of basaltic glass increases with the increase of La₂O₃ content. The aqueous durability of samples was evaluated by the ASTM product consistency test (PCT) method, which shows that all the samples have good leaching resistance, the leaching rates of La in sample L12 is the lowest after 28 days of leaching, and the leaching rates of La and Fe are three orders of magnitude lower than those of the other elements.

Key words： La₂O₃ basaltic glass high-level radioactive waste PCT

Published: Online: 2023-12-19

CLC number:

TL941+.33

Fund:State Key Laboratory of Environment-friendly Energy Materials (20fksy08) and Advanced Material Major Science and Technology Project of Sichuan Province(2019ZDZX0023).

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	Articles by authors
	TONG Qin
	HUO Jichuan
	ZHANG Xingquan
	HUO Yonglin
	XU Chong
	JIANG Qin
	SONG Weiwei

Cite this article:

TONG Qin,HUO Jichuan,ZHANG Xingquan, et al. Study on Structure and Properties of La₂O₃-doped Basaltic Glasses for Immobilizing Simulated Lanthanides[J]. Materials Reports, 2023, 37(24): 21110089-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21110089 OR http://www.mater-rep.com/EN/Y2023/V37/I24/21110089

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