{"title":"不同 pH 值条件下 YIG 和 HEG 的化学稳定性和浸出机理","authors":"Shengtai Zhang, Zhen Teng, Linzhen Wu, Yongqiang Tan, Chen Chen, Xiaosong Zhou","doi":"10.1111/jace.19975","DOIUrl":null,"url":null,"abstract":"<p>Designing waste forms using the cocktail effect of high-entropy ceramics can improve the efficiency of ceramic waste forms. In this work, traditional garnet (Y<sub>1.2</sub>Nd<sub>1.8</sub>Fe<sub>5</sub>O<sub>12</sub>, YIG) and high-entropy (HE) garnet (Y<sub>0.6</sub>Gd<sub>0.6</sub>Sm<sub>0.6</sub>Eu<sub>0.6</sub>Dy<sub>0</sub>.<sub>6</sub>Fe<sub>5</sub>O<sub>12</sub>, 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.</p>","PeriodicalId":200,"journal":{"name":"Journal of the American Ceramic Society","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.19975","citationCount":"0","resultStr":"{\"title\":\"Chemical stability and leaching mechanism of YIG and HEG at different pH conditions\",\"authors\":\"Shengtai Zhang, Zhen Teng, Linzhen Wu, Yongqiang Tan, Chen Chen, Xiaosong Zhou\",\"doi\":\"10.1111/jace.19975\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>Designing waste forms using the cocktail effect of high-entropy ceramics can improve the efficiency of ceramic waste forms. In this work, traditional garnet (Y<sub>1.2</sub>Nd<sub>1.8</sub>Fe<sub>5</sub>O<sub>12</sub>, YIG) and high-entropy (HE) garnet (Y<sub>0.6</sub>Gd<sub>0.6</sub>Sm<sub>0.6</sub>Eu<sub>0.6</sub>Dy<sub>0</sub>.<sub>6</sub>Fe<sub>5</sub>O<sub>12</sub>, 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.</p>\",\"PeriodicalId\":200,\"journal\":{\"name\":\"Journal of the American Ceramic Society\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":3.5000,\"publicationDate\":\"2024-07-08\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jace.19975\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of the American Ceramic Society\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1111/jace.19975\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the American Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/jace.19975","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
Chemical stability and leaching mechanism of YIG and HEG at different pH conditions
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.
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.
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