Immobilization of simulated waste into pure Gd2Zr2O7 pyrochlore without space occupancy design

In this study, different molar ratios of Nd:Ce were directly mixed with prepared pure Gd2Zr2O7 powders without space occupancy design. Samples were obtained by performing sparking plasma sintering (SPS) at 1750°C for 5 minutes. X‐ray diffraction (XRD) results show that maximum solid solubility of si...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2020-08, Vol.103 (8), p.4700-4712
Main Authors: Wu, Jianjun, Luo, Fen, Shu, Xiaoyan, Chen, Shunzhang, Wei, Guilin, Li, Bingsheng, Xie, Yi, Yuan, Wenqing, Yi, Facheng, Lu, Xirui
Format: Article
Language:English
Subjects:
Crystallization
directly mixed
nuclear waste
Occupancy
Plasma sintering
pure Gd2Zr2O7 powders
Radioisotopes
Solid solubility
Spark plasma sintering
sparking plasma sintering
Temperature
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Summary:In this study, different molar ratios of Nd:Ce were directly mixed with prepared pure Gd2Zr2O7 powders without space occupancy design. Samples were obtained by performing sparking plasma sintering (SPS) at 1750°C for 5 minutes. X‐ray diffraction (XRD) results show that maximum solid solubility of simulated radionuclides can reach 50 mol%. In addition, all samples with the maximum solid solubility have high compactness, and all elements are evenly distributed on the surface of the samples. The samples show a better crystallization effect as the molar ratio of Nd:Ce increases. The maximum solid solubility increases from 42 mol% to 50 mol% when the amount of Nd2O3 reaches 66 mol%.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.17138