张魁宝,李伟伟,谢达雁,骆宝珠,张海斌.燃烧反应制备Y2-xGdxTi2O7 烧绿石及其作为核废物固化材料的稳定性研究[J].稀有金属材料与工程,2020,49(7):2299~2304.[Kuibao Zhang,Weiwei Li,Dayan Xie,Baozhu Luo,Haibin Zhang.Combustion reaction synthesis of Y2-xGdxTi2O7 pyrochlores and its aqueous durability as nuclear waste mateiral[J].Rare Metal Materials and Engineering,2020,49(7):2299~2304.]
燃烧反应制备Y2-xGdxTi2O7 烧绿石及其作为核废物固化材料的稳定性研究
投稿时间:2019-04-25  修订日期:2019-05-22
中文关键词:  燃烧反应制备  核废物  烧绿石  化学稳定性
基金项目:国家自然科学基金 (No. 51672228)
中文摘要:
      烧绿石基陶瓷材料是理想的核废物固化基材,本研究采用燃烧反应结合快速加压工艺,以CuO 为氧化剂、Ti为还原剂,在5分钟内快速制备出烧绿石基 Y2-xGdxTi2O7/Cu复合材料固化体。以Gd作为三价锕系核素的模拟物,设计Gd取代Y2-xGdxTi2O7烧绿石中的Y位。研究结果表明,Gd能完全取代Y位形成Gd2Ti2O7 烧绿石,所得产物没有杂质相的出现,且在烧绿石基体中没有出现相分离现象。选择Gd1.0样品进行浸出实验,结果表明该样品具有优异的水热稳定性,Cu, Y 和 Gd 元素的42天归一化浸出率分别低至 2.4×10-2, 1.1×10-5和5.3×10-6 g?m-2?d-1
Combustion reaction synthesis of Y2-xGdxTi2O7 pyrochlores and its aqueous durability as nuclear waste mateiral
英文关键词:Combustion  reaction synthesis, Nuclear  waste, Pyrochlore, Chemical  durability.
英文摘要:
      Pyrochlore-based ceramic is recognized as promising nuclear waste matrice. In this study, pyrochlore-based Y2-xGdxTi2O7/Cu composite waste forms were rapidly prepared within 5 minutes by combustion reaction plus quick pressing (CR/QP) synthesis route, where CuO was utilized as the oxidant and Ti as the reductant. As the surrogate of trivalent actinide nuclides, Gd was introduced to substitute the Y site with nominal formulation of Y2-xGdxTi2O7. The results demonstrate that Gd can totally replace the Y site and Gd2Ti2O7 pyrochlore can be readily synthesized. There is no impurity phase generated in the products, and phase separation is not detected in the pyrochlore matrix. The selected Gd1.0 waste form exhibits promising aqueous durability as the 42 days normalized leaching rates of Cu, Y and Gd elements are evaluated as low as 2.4×10-2, 1.1×10-5 and 5.3×10-6 g.m-2.d-1.
作者单位E-mail
张魁宝 西南科技大学 xiaobao320@163.com 
李伟伟 西南科技大学  
谢达雁 西南科技大学  
骆宝珠 西南科技大学  
张海斌 中国工程物理研究院  
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