Journal of Inorganic Materials ›› 2022, Vol. 37 ›› Issue (7): 757-763.DOI: 10.15541/jim20210669

Special Issue: 【结构材料】核用陶瓷

• RESEARCH ARTICLE • Previous Articles     Next Articles

Immobilizing Behavior of Trivalent Actinide Nuclides by YIG Ceramics

LUO Shilin1,2(), ZHANG Shengtai1, XU Baoliang1, WANG Lingkun1, DUAN Siyihan1, DING Yi1, ZHAO Qian1, DUAN Tao1()   

  1. 1. National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China
    2. Physics and Space Sciences College, China West Normal University, Nanchong 637002, China
  • Received:2021-11-01 Revised:2022-01-20 Published:2022-07-20 Online:2022-01-24
  • Contact: DUAN Tao, professor. E-mail:
  • About author:LUO Shilin (1995-), male, Master candidate. E-mail:
  • Supported by:
    National Key R&D Program of China(2016YFC1402500);National Natural Science Foundation of China(41272050);National Natural Science Foundation of China(21976148)


Garnet is considered as a potential matrix for immobilizing high-level radioactive waste (HLW) because of its large actinide package capacity and chemical flexibility. Y3-xNdxFe5O12 (0≤x≤2) series yttrium iron garnet (YIG) samples was successfully synthesized by solid-state sintering method using Nd3+ to simulate trivalent actinides. The solubility limit of Nd in the YIG and the influence of Nd doping amount on the phase and microstructure of ceramics was studied. Then the chemical durability of Nd-doped yttrium iron garnet solidified body under different pH conditions was evaluated. The results show that the ceramics with x≤1.7 show homogeneous single YIG, but the ceramics with x≥1.8 exhibit coexistence of three crystal phases (YIG, NdFeO3 and Fe2O3). The solubility limit of Nd3+ in the pure YIG is about 29.5% (in mass). As the amount of Nd doping increases, the density of the ceramics increases, the volume decreases, and the porosity decreases. The leaching experiment results show that the normalized leaching rate of the elements (LRi) is 10-6~10-5g·m-2·d-1. LRY is smaller than LRNd, and the normalized leaching rate of the elements in acid leachate is slightly higher than those in neutral and alkaline leachates. The results indicate that YIG ceramics are a potential candidate form for trivalent actinides.

Key words: yttrium iron garnet (YIG), actinide, phase evolution, chemical stability

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