Phase structure and aqueous stability of TRPO waste incorporation into Gd2Zr2O7 pyrochlore

Phase structure and aqueous stability of TRPO waste incorporation into Gd2Zr2O7 pyrochlore
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TRPO 废物掺入 Gd2Zr2O7 烧绿石的相结构和水稳定性

DOI:
10.1016/j.ceramint.2015.05.140
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发表时间:
2015-11
影响因子:
5.2
通讯作者:
Yanlin Wu
Yanlin Wu
中科院分区:
材料科学1区
文献类型:
--
作者:
Yi Ding;Tao Duan;Bingrong Dang;Yanlin Wu

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本工作探讨了Gd 2 Zr 2 O 7烧绿石基材料用于掺入三烷基氧化膦(TRPO)废物的潜力,TRPO废物是一种多价态的多核素混合物。合成了一系列(Gd,A)2(Zr,B)2 O 7陶瓷,研究了多核素掺杂对Gd 2 Zr 2 O 7相结构和水稳定性的影响。XRD和BSE测试结果表明,所有的陶瓷都具有单一的烧绿石结构。拉曼光谱表明,(Gd,A)2(Zr,B)2 O 7固溶体的结构有序度随着TRPO废料含量的增加而增加。此外,使用MCC-1静态浸出试验方法进行水稳定性试验。结果表明,TRPO废物中元素的归一化释放速率保持在10 - 4g m-2d-1以下的低值。La显示出所有相关元素的最高归一化释放速率,而Zr显示出最好的化学稳定性。
The present work explores the potential of Gd2Zr2O7pyrochlore based materials for incorporation of trialkyl phosphine oxides (TRPO) waste which is a mixture of multi-nuclides with multi-valence. A series of (Gd,A)2(Zr,B)2O7ceramics were synthesized to investigate the influence of multi-nuclides incorporation on phase structure and aqueous stability of Gd2Zr2O7. XRD and BSE results show that all the ceramics exhibit a single pyrochlore structure. Raman spectroscopy reveals that the degree of structural order for (Gd,A)2(Zr,B)2O7solid solutions increases with enhanced TRPO waste content. In addition, aqueous stability testing was carried out using the MCC-1 static leach test method. The results demonstrate that the normalized release rates of the elements in TRPO waste are kept in a low value below 10−4g m−2d−1. La shows the highest normalized release rate of all the involved elements, while Zr exhibits the best chemical stability.
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