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

Author:

Zhang Shengtai12,Xu Baoliang1,Cheng Jingkai1,Luo Shilin1,Ding Yi1ORCID,Ji Shiyin1,Duan Tao13ORCID,Ma Jianjun2,Jiang Cairong2

Affiliation:

1. National Co‐Innovation Center for Nuclear Waste Disposal and Environmental Safety Southwest University of Science and Technology Mianyang P. R. China

2. School of Materials Science and Engineering Sichuan University of Science and Engineering Zigong P.R. China

3. State Key Laboratory of Environment‐friendly Energy Materials Southwest University of Science and Technology Mianyang P.R. China

Abstract

AbstractMolten salt provides a fast mass transfer and nucleation process, so the ceramic solid solution for immobilization of high‐level nuclear waste (HLW) can be synthesized at lower temperatures. The chemical stability in the process of interaction with groundwater determines the ability of the matrix phase to prevent radionuclides from entering the biosphere. Nd‐doped Y3Fe5O12 ceramics were prepared by the molten salt method at different sintering temperatures (1000℃, 1100℃, 1200℃) and different m (eutectic salt): m (oxide) ratios (2:1, 3:1, 4:1). The sintered ceramic is Y3‐xNdxFe5O12, where x is the solubility of Nd in YIG. The results show that the optimum mass ratio of molten salt to oxide is 3:1. The solubility of Nd in garnet is 33.3 mol% (x = 1.1) and 56.7 mol% (x = 1.6) at 1100℃ and 1200℃, respectively. In the neutral medium, Nd does not transfer to the liquid phase. Acid leaching promotes the strong dissolution of the garnet matrix. In this case, the leaching rate of Nd from ceramics to the liquid phase is two to three orders of magnitude higher than that in a neutral medium. The experimental results suggest that garnet matrices can reliably immobilize actinides in subsurface repositories.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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