Chemical stability and leaching mechanism of YIG and HEG at different pH conditions

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2024-07-08 DOI:10.1111/jace.19975

Shengtai Zhang, Zhen Teng, Linzhen Wu, Yongqiang Tan, Chen Chen, Xiaosong Zhou

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Abstract

Designing waste forms using the cocktail effect of high‐entropy ceramics can improve the efficiency of ceramic waste forms. In this work, traditional garnet (Y1.2Nd1.8Fe5O12, YIG) and high‐entropy (HE) garnet (Y0.6Gd0.6Sm0.6Eu0.6Dy0.6Fe5O12, HEG) are synthesized through ignition and plasma sintering to form dense ceramic waste forms. The chemical stability of YIG and HEG was studied by using static leaching tests at pH = 3, 5, 7, 9, 11. The results indicate that acidic environments can increase the leaching rate of ceramics. Leaching behavior leads to a decrease in lattice volume, but the elements remain uniformly distributed. The leaching mechanism indicates that YIG and HEG are controlled by dissolution and surface effect in the early stage (1–7 days) of leaching. The leaching mechanism in the later stage (14–42 days) is characterized by diffusion control. The diffusion coefficient of long‐term leaching indicates that HEG is more suitable as the immobilization substrate for high‐level radioactive waste (HLW) than YIG.

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不同 pH 值条件下 YIG 和 HEG 的化学稳定性和浸出机理

利用高熵陶瓷的鸡尾酒效应设计废物形式可以提高陶瓷废物形式的效率。在这项工作中，传统石榴石（Y1.2Nd1.8Fe5O12，YIG）和高熵（HE）石榴石（Y0.6Gd0.6Sm0.6Eu0.6Dy0.6Fe5O12，HEG）通过点火和等离子烧结合成了致密陶瓷废料。通过在 pH = 3、5、7、9、11 条件下进行静态浸出试验，研究了 YIG 和 HEG 的化学稳定性。结果表明，酸性环境会增加陶瓷的浸出率。浸出行为会导致晶格体积减小，但元素仍然均匀分布。沥滤机理表明，在沥滤初期（1-7 天），YIG 和 HEG 受溶解和表面效应控制。后期（14-42 天）的浸出机制则以扩散控制为特征。长期浸出的扩散系数表明，HEG 比 YIG 更适合作为高放射性废物（HLW）的固定基质。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.