Effects of alpha irradiation on Nd2Zr2O7 matrix for nuclear waste forms

Chen, Shunzhang; Shu, Xiaoyan; Wang, Lan; Chi, Fangtin; Shao, Dadong; Ding, Yi; Yuan, Xun; Qi, Qing; Lu, Xirui

doi:10.1007/s41779-017-0123-x

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…8. It shows the structural disordering tends to increase with increased CeO 2 and the main Raman spectroscopy inclines to be homogeneous [28,29] . and (c 1 ) that the surface of the samples was smooth and bright, which is essentially consistent with the macro-profile and the XRD results that these samples are mainly glass.…”

Section: Raman Analysismentioning

confidence: 97%

Natural magmatic granite as matrix for immobilizing simulated An4+ waste

Li¹,

Shu²,

Tang³

et al. 2020

Preprint

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In nature, many rocks contain radionuclides, and returning radioactive waste to nature is an environmentally friendly way. In this work, a natural magmatic granite rock has been studied as a host matrix for simulated An4+ waste disposal. The blank granite, in the form of powder, was firstly treated by muffle furnace heating in the temperature range of 800 °C to 1400 °C. It was found that the lowest crystallinity of the samples was obtained at 1300 °C. Moreover, 8 wt.% of simulated tetravalent actinides (CeO2) could be successfully immobilized in the natural granite at 1300 °C for 60 min. Raman results show the structure disordering in samples tends to increase with the increased amount of CeO2. SEM-EDS observation shows that the distribution of Ce was relatively uniform in the matrix. Moreover, the hardness of solidified body is comparable to traditional glasses and it decreases with the increase of CeO2 content.

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Section: Raman Analysismentioning

confidence: 97%

Natural magmatic granite as matrix for immobilizing simulated An4+ waste

Li¹,

Shu²,

Tang³

et al. 2020

Preprint

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“…20,21 It comes up changes in ordering degree through phase transition, which could enhance the overall stability. 22,23 Regrettably, as a ceramic host material, it intrinsically requires extremely careful structure design due to the significant role of valence balance and ionic radius in forming a solid solution. 24,25 Therefore, the study ofGd 2 Zr 2 O 7 glass-ceramics is rather necessary.…”

Section: Introductionmentioning

confidence: 99%

“…From the aspect of loading types, it was proved to simultaneously load 11 kinds of simulated nuclides in a single phase; from the aspect of loading capacity, it can bear 82.29 wt.% of U 3 O 8 without structure failure; from the aspect of irradiation tolerance, its crystalline structure could be maintained after being irradiated by 190 MeV U ions at 4 × 10 13 ions/cm 2 or being irradiated with 70 MeV Ni ions at a common fluence of 1 × 10 14 ions/cm 2 ; from the aspect of chemical durability, its simulated nuclear waste forms maintained a leaching ratio below 10 −4 gm −2 d −1 after being soaked in water at 70°C for 42 days . It comes up changes in ordering degree through phase transition, which could enhance the overall stability . Regrettably, as a ceramic host material, it intrinsically requires extremely careful structure design due to the significant role of valence balance and ionic radius in forming a solid solution .…”

Section: Introductionmentioning

confidence: 99%

Rapid synthesis of Gd₂Zr₂O₇ glass‐ceramics using spark plasma sintering

et al. 2019

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Glass‐ceramics are possible host matrix for high level waste immobilization. The Gd2Zr2O7 glass‐ceramic matrix was successfully synthesized using spark plasma sintering (SPS) method in 5 minutes. The phase transition with sintering temperature was studied using X‐ray diffraction, Raman and transmission electron microscopy. It revealed that samples kept a main defected fluorite phase as being sintered below 1800°C. Glass phase increased rapidly beyond 1850°C. The amorphous structure became the main body at 1900°C, with nanoscale crystal scattered in the bulk. With the increase of glass phase, the grain boundary became almost indistinguishable. The relationship between the final phase of Gd2Zr2O7 with its synthetic temperature range and corresponding technology was reviewed. Gd2Zr2O7 glass‐ceramics could be acquired by extending the sintering temperature beyond 1850°C using SPS method.

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