Phase evolution and chemical stability of Nd‐doped Y3Fe5O12 waste forms synthesized in molten salt at a low temperature

Zhang, Shengtai; Xu, Beibei; Cheng, Jingkai; Luo, Shilin; Ding, Yi; Ji, Shiyin; Duan, Tao; Ma, Jianjun; Jiang, Cairong

doi:10.1111/jace.18122

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…REE elements of the REE-MA fraction (MA = Am, Cm) exist as trivalent ions, Ce can be partially in the form of Ce 4+ . To simulate actinides in matrices, lanthanides are used, and Ce, Th or U are introduced instead of Pu [ 47 , 70 , 71 ]. Due to close ionic radii [ 50 ], Ce 3+ simulates Pu 3+ , while Nd 3+ and Eu 3+ simulate Cm 3+ and Am 3+ .…”

Section: Zirconolite and Murataite As Matrices For The Immobilization...mentioning

confidence: 99%

Zirconolite Polytypes and Murataite Polysomes in Matrices for the REE—Actinide Fraction of HLW

et al. 2022

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Electron backscatter diffraction (EBSD) has been used for more than 30 years for analyzing the structure of minerals and artificial substances. In recent times, EBSD has been widely applied for investigation of irradiated nuclear fuel and matrices for the immobilization of radioactive waste. The combination of EBSD and scanning electron microscopy (SEM/EDS) methods allows researchers to obtain simultaneously data on a specimen’s local composition and structure. The article discusses the abilities of SEM/EDS and EBSD techniques to identify zirconolite polytype modifications and members of the polysomatic murataite–pyrochlore series in polyphase ceramic matrices, with simulations of Pu (Th) and the REE-actinide fraction (Nd) of high-level radioactive waste.

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Section: Zirconolite and Murataite As Matrices For The Immobilization...mentioning

confidence: 99%

Zirconolite Polytypes and Murataite Polysomes in Matrices for the REE—Actinide Fraction of HLW

et al. 2022

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“…According to previous research, 35,36 a rise in Nd content may also affect the evolution of the solid solution's physical phase. Figure 3 shows the phase evolution under different dosages.…”

Section: Phase Composition and Evolutionmentioning

confidence: 95%

“…Obviously, when the Nd substitution level was x + y = 2.4, the main phase was found to be perovskite while the second phase was garnet, and the zirconia phase gradually disappeared. Although the perovskite structure can also be used as solidified substrate, other researchers 35,36 have shown that the chemical stability of the perovskite structure is lower than that of the garnet structure. In addition, our previous study also showed that the presence of the perovskite phase can adversely affect the chemical stability of garnet solid solution.…”

Section: Phase Composition and Evolutionmentioning

confidence: 99%

Zirconia/garnet multiphase ceramics with high immobilization capacity for Nd confers better physical and chemical stability

Ge,

Xu,

Liao

et al. 2023

J Am Ceram Soc.

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Multiphase ceramics have a high application potential in the field of nuclear waste immobilization because of the efficient synergy between the individual phases. In this work, zirconia/garnet multiphase ceramics with high efficient and effective immobilization capacity of trivalent actinides were successfully prepared using conventional solid‐phase sintering. ZrO2 doping increases the lattice site available for nuclide substitution and advance the immobilization capacity of the ceramic substrate for nuclide. At the same time, the phase change of zirconia is used to tougher and improve the physical properties of the ceramic waste form. The feasibility of using multiphase ceramics for the efficient immobilization of trivalent actinides was assessed by studying the phase evolution, microstructure, Vickers hardness, and chemical stability of the multi‐phase ceramics. Zr1‐xNdxO2‐x/2/Ca3‐yNdyZr3‐yFey‐1Fe3O12 multiphase ceramics exhibited superior physical or chemical properties compared to most of the multiphase ceramics as well as the previously prepared single‐phase calcium garnet ceramic waste forms. The Vickers hardness of all the multiphase ceramic samples ranged between 685 and 730 HV0.5. Under the condition of using simulate Bei Shan groundwater as leaching agent, the normalized leaching rates of Nd is approximately 10−6 g·m−2·day−1, showing good chemical stability and achieving efficient and effective immobilization of trivalent actinides. The excellent chemical, as well as physical properties of Zr1‐xNdxO2‐x/2/Ca3‐yNdyZr3‐yFey‐1Fe3O12 multiphase ceramics are expected to make them one of the substrates for more efficient and effective immobilizing of trivalent actinides.

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High Dielectric Constant YIG Ferrites with Low Sintering Temperature

Peng

et al. 2022

J Mater Sci: Mater Electron

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Phase evolution and chemical stability of Nd‐doped Y₃Fe₅O₁₂ waste forms synthesized in molten salt at a low temperature

Abstract: Shengtai Zhang and Baoliang Xu contributed equally to this study.

Cited by 10 publications

References 37 publications

Zirconolite Polytypes and Murataite Polysomes in Matrices for the REE—Actinide Fraction of HLW

Zirconolite Polytypes and Murataite Polysomes in Matrices for the REE—Actinide Fraction of HLW

Zirconia/garnet multiphase ceramics with high immobilization capacity for Nd confers better physical and chemical stability

High Dielectric Constant YIG Ferrites with Low Sintering Temperature

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