Nd<sub>2</sub>O<sub>3</sub>对钼酸钙-钙钛锆石硼硅酸盐玻璃陶瓷结构和性能的影响

doi:10.11896/cldb.21020054

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Abstract In this paper, a borosilicate glass-ceramic waste form with powellite and zirconolite as the main crystalline phases was developed, for the high content of lanthanide (Ln) and transition metal (Mo) in high-level liquid waste arising from spent nuclear fuel reprocessing, and the phase composition, structure and leaching properties of glass-ceramic forms with content of 0mol%—5mol%Nd₂O₃ were investigated. The results show that two major target phases, powellite and zirconolite, are observed for the glass-ceramics with 0mol%—3mol% Nd₂O₃, which are homogenously distributed in the glass matrix. With Nd₂O₃ addition, the BO₄ group transformed to BO₃, bulk density and oxygen packing density gra-dually increased, and the structure became denser. PCT result shows that after 28 d, the leaching rate of glass-ceramic incorporated Nd₂O₃ reduced by about two orders of magnitude lower than that of those without Nd₂O₃ glass ceramic, and for the sample with 3 mol% Nd₂O₃, of which LR_Si, LR_Ca, LR_Mo and LR_Nd are approximately 1.90×10^-3 g·m^-2·d^-1, 6.38×10^-4 g·m^-2·d^-1, 8.27×10^-5 g·m^-2·d^-1and 1.42×10^-6 g·m^-2·d^-1.

Key words： high-level liquid waste glass-ceramic powellite zirconolite chemical durability

Published: Online: 2022-04-07

CLC number:

TQ171.9

Fund:National Natural Science Foundation of China (11775182).

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	LIAN Qihui
	ZHANG Xingquan
	HUO Jichuan
	WU Lang
	ZHANG Zhuangsen

Cite this article:

LIAN Qihui,ZHANG Xingquan,HUO Jichuan, et al. Effect of Nd₂O₃ on Structure and Properties of Powellite-Zirconolite Borosilicate Glass Ceramics[J]. Materials Reports, 2022, 36(7): 21020054-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21020054 OR http://www.mater-rep.com/EN/Y2022/V36/I7/21020054

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