Synthesis and characterisation of the hollandite solid solution Ba1.2-xCsxFe2.4-xTi5.6+xO16 for partitioning and conditioning of radiocaesium

Synthesis and characterisation of the hollandite solid solution Ba1.2-xCsxFe2.4-xTi5.6+xO16 for partitioning and conditioning of radiocaesium
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用于放射性铯分配和调理的镁锰矿固溶体 Ba1.2-xCsxFe2.4-xTi5.6 xO16 的合成和表征

DOI:
10.1016/j.jnucmat.2018.03.005
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发表时间:
2018
影响因子:
3.1
通讯作者:
Bailey D
Bailey D
中科院分区:
工程技术2区
文献类型:
--
作者:
Bailey D

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高放废物的地质处置需要对放射性衰变产生的热负荷进行仔细的预算。去除产生高热的放射性核素,如137 Cs,减少了处置库中的热负荷,使剩余的高放废物能够更紧密地堆积在一起,从而减少了对处置库空间的需求和剩余废物的处置成本。奥朗德人已被提议作为一个可能的主机矩阵的长期处置的Cs从高放废物萃余液分离。Cs掺入到的硬硅钙石相的辅助下,取代阳离子的硬硅钙石结构的B-网站上,包括铁。一系列的铯含铁的hollandites合成通过烷氧基-硝酸盐路线和结构环境的Fe在所得材料的特征在于穆斯堡尔谱和X射线吸收近边光谱。光谱分析的结果发现,在所有的情况下,铁是作为八面体配位的Fe(III),并作为一个有效的电荷补偿在一个宽的固溶体范围。
The geological disposal of high level radioactive waste requires careful budgeting of the heat load produced by radiogenic decay. Removal of high-heat generating radionuclides, such as137Cs, reduces the heat load in the repository allowing the remaining high level waste to be packed closer together therefore reducing demand for repository space and the cost of the disposal of the remaining wastes. Hollandites have been proposed as a possible host matrix for the long-term disposal of Cs separated from HLW raffinate. The incorporation of Cs into the hollandite phase is aided by substitution of cations on the B-site of the hollandite structure, including iron. A range of Cs containing iron hollandites were synthesised via an alkoxide-nitrate route and the structural environment of Fe in the resultant material characterised by Mössbauer and X-ray Absorption Near Edge Spectroscopy. The results of spectroscopic analysis found that Fe was present as octahedrally co-ordinated Fe (III) in all cases and acts as an effective charge compensator over a wide solid solution range.
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