Phase evolution and chemical durability of Nd-doped zircon ceramics designed to immobilize trivalent actinides

Ding, Yi; Lu, Xirui; Dan, Hui; Shu, Xiaoyan; Zhang, Shuai; Duan, Tao

doi:10.1016/j.ceramint.2015.04.092

Cited by 41 publications

(12 citation statements)

References 27 publications

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“…Recently, they have been used for the development of dual-wavelength lasers [5]. Furthermore, they can be also used to immobilize nuclear waste [6].…”

Section: Introductionmentioning

confidence: 99%

High-pressure lattice-dynamics of NdVO4

Panchal¹,

Errandonea

Manjón

et al. 2017

Journal of Physics and Chemistry of Solids

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High-pressure Raman-scattering measurements and ab initio calculations on NdVO4 have been carried out up to 30 GPa. Our combined experimental and theoretical study confirms that beyond 5.9 GPa NdVO4 undergoes an irreversible zircon to monazite transition. The coexistence of zircon and monazite phases is experimentally observed up to ~ 8 GPa (which agrees with the theoretical transition pressure), stabilizing the monazite phase as a single phase around 10 GPa. Calculations additionally predict the existence of a second high-pressure phase transition at 12.4 GPa. This reversible phase transition has been experimentally observed beyond 18.1 GPa and remains stable up to 30 GPa. The post-monazite phase is predicted to have a monoclinic structure isomorphic to the BaWO4-II type structure. The calculated structure for the three polymorphs of NdVO4 is reported and the pressure dependence of their Raman modes is discussed.

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“…Recently, they have been used for the development of dual-wavelength lasers [5]. Furthermore, they can be also used to immobilize nuclear waste [6].…”

Section: Introductionmentioning

confidence: 99%

High-pressure lattice-dynamics of NdVO4

Panchal¹,

Errandonea

Manjón

et al. 2017

Journal of Physics and Chemistry of Solids

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“…It could be found that the density value display a gradual increase as the content Nd increase in the solid solution. The highest density achieved as 3.784 g· cm -3 [19]. So the density of Nd-doped ceramics increases with the amount of simulated nuclide Nd.…”

Section: Resultsmentioning

confidence: 81%

Density and hardness of Nd-doped zircon ceramics as nuclear waste forms

Yuan

Wang

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Zircon ceramics were employed as host material for immobilization of element Nd, which was used as the surrogate of trivalent actinide nuclide. A series of Zr 2-x Nd x Si 2 O 8-0.5x compounds were prepared by solid-state reaction method at 1500 ℃ for 72 h in air and investigated in respect of their physics performances. These performances were characterized by density and hardness. The results show that the density raises as the value of x increases from 0.02 to 0.20. Moreover, the hardness of the Nd-doped ceramic also increase with enhanced Nd content.

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“…The leaching test of the (Gd,A) 2 (Zr,B) 2 O 7 waste forms has been studied at 70 C for 14 days, considering the crucial role of chemical durability for the solidified waste. [49][50][51][52] The normalized LR of Mo, Zr, Ru, and Pd in the compound (Gd,A) 2 (Zr,B) 2 O 7 with 20 wt% of doping content are shown in Figure 10. The results indicate that the LR Zr , LR Ru, and LR Pd decrease significantly in the first 3 days.…”

Section: Chemical Durability Analysismentioning

confidence: 99%

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

Wei

Wen³

et al. 2021

Int J Energy Res

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As a rapid sintering method, spark plasma sintering (SPS) process has been widely applied to immobilize nuclear waste. In this work, trialkyl phosphine oxides (TRPO) were immobilized by the mixture of Gd 2 O 3 and ZrO 2 with SPS proceedings at 1650 C in 3 minutes. X-ray diffraction results present that the solid solubility is 10 to 20 wt% and all the sintered samples show a fluorite structure. Raman spectroscopy results show that the order degree of structure decreases as waste content increases. The lattice parameters decrease with the increasing doped waste content indicating the success of waste immobilization. Densities decrease for the sample with higher waste content which mainly caused by the existence of pores. Scanning electron microscope-energy dispersive X-ray spectroscopy and backscattered electron results perform the microstructure of the sintered sample. Furthermore, the leaching test shows that the sample has a considerable chemical stability. This study confirmed the possibility of rapid consolidation of Gd 2 Zr 2 O 7 bulk, dense ceramic with up to 10~20 wt% of immobilized TRPO waste. Highlights• Multi-nuclides waste was rapidly immobilized by Gd 2 Zr 2 O 7 via SPS process.• Phase transition happened with enhanced doping content.• Density results decreased with the higher waste content.• The order degree of structure decreased as waste content increased.• The sintered matrix represented considerable chemical stability. K E Y W O R D S ceramic, Gd 2 Zr 2 O 7 , immobilization, SPS, TRPO waste Ningning He and Guilin Wei contributed equally to this work.

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Phase evolution and chemical durability of Nd-doped zircon ceramics designed to immobilize trivalent actinides

Cited by 41 publications

References 27 publications

High-pressure lattice-dynamics of NdVO4

High-pressure lattice-dynamics of NdVO4

Density and hardness of Nd-doped zircon ceramics as nuclear waste forms

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics

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Phase evolution and chemical durability of Nd-doped zircon ceramics designed to immobilize trivalent actinides

Cited by 41 publications

References 27 publications

High-pressure lattice-dynamics of NdVO4

High-pressure lattice-dynamics of NdVO4

Density and hardness of Nd-doped zircon ceramics as nuclear waste forms

Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd 2 Zr 2 O 7 ceramics

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Product

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Effect of improved trialkyl phosphine oxides waste content on phase composition and density of spark plasma sintered Gd ₂ Zr ₂ O ₇ ceramics