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同步辐射XAFS技术研究Th1-
x Ux O2+y 的微观结构Study on the microstructure of Th1-
x Ux O2+y by synchrotron radiation XAFS technique- 核技术 2018年41卷第7期 文章编号：070102
- 作者机构：
1.中国科学院上海应用物理研究所 嘉定园区 上海 201800
2.中国科学院大学 北京 100049
- 作者简介：
[ "解春雨, 女, 1990年出生, 2013年毕业于华北电力大学, 现为博士研究生, 研究方向为同步辐射XAFS技术在核能材料中的应用", "XIE Chunyu, female, born in 1990, graduated from University of North China Electric Power University in 2013, doctoral student, focusing on the applications in nuclear fuel materials by XAFS technique" ]
鲍洪亮, E-mail:baohongliang@sinap.ac.cn BAO Hongliang, E-mail: baohongliang@sinap.ac.cn
王建强, E-mail:wangjianqiang@sinap.ac.cn WANG Jianqiang, E-mail: wangjianqiang@sinap.ac.cn
- 基金信息：国家自然科学基金(21701183)
DOI：10.11889/j.0253-3219.2018.hjs.41.070102
中图分类号： TL99收稿日期：2018-03-17，
修回日期：2018-04-23，
纸质出版日期：2018-07-10
- 稿件说明：
移动端阅览
解春雨, 曹罕杰, 岳增慧, 等. 同步辐射XAFS技术研究Th1-
x Ux O2+y 的微观结构[J]. 核技术, 2018,41(7):070102Chunyu XIE, Hanjie CAO, Zenghui YUE, et al. Study on the microstructure of Th1-
x Ux O2+y by synchrotron radiation XAFS technique[J]. Nuclear techniques, 2018, 41(7): 070102解春雨, 曹罕杰, 岳增慧, 等. 同步辐射XAFS技术研究Th1-
x Ux O2+y 的微观结构[J]. 核技术, 2018,41(7):070102 DOI： 10.11889/j.0253-3219.2018.hjs.41.070102.Chunyu XIE, Hanjie CAO, Zenghui YUE, et al. Study on the microstructure of Th1-
x Ux O2+y by synchrotron radiation XAFS technique[J]. Nuclear techniques, 2018, 41(7): 070102 DOI： 10.11889/j.0253-3219.2018.hjs.41.070102.
摘要
钍铀混合氧化物存在于钍基核燃料循环的各个阶段，其熔点、溶解性、氧化还原等物理化学性能与微观结构之间存在密切联系。为了宏观模拟钍铀混合氧化物的物理化学性能和提供相关的微观结构实验数据，我们利用同步辐射X射线吸收精细结构（X-ray Absorption Fine Structure，XAFS）谱技术，获取了共沉淀法制备的Th
1-
x
U
x
O
2+
y
混合氧化物样品的钍和铀的局域结构。Th和U的L
3
边XAFS实验数据表明：Th
1-
x
U
x
O
2+
y
的主导结构是ThO
2
成分与局域U
3
O
8
成分的微观混合。对Th
0.8
U
0.2
O
2+
y
样品的扩展X射线吸收谱（Extended X-ray Adsorption Fine Structure，EXAFS）实验数据进行深入分析表明：Th-U相互作用的存在使得ThO
2
成分的Th-Th/U键长与纯ThO
2
相比缩短0.003 nm，同时，局域U
3
O
8
成分的平均U-O键长与纯U
3
O
8
相比增加约0.01 nm。
Abstract
Background
2
Thorium-uranium mixed oxides exist in different stages of the thorium fuel cycle. The physicochemical properties of Th-U mixed oxides
such as melting point
solubility
and oxido-reduction
are closely related to their microstructures.
Purpose
2
This study aims to study the microstructure of the Th-U mixed oxides by X-ray absorption fine structure (XAFS) technique. In order to macroscopically simulate the physical and chemical properties of Th-U mixed oxides
relevant microstructure data are provided.
Methods
2
The local structures of Th and U in as-prepared Th
1-
x
U
x
O
2+
y
samples are obtained by XAFS spectroscopy technique.
Results
2
The Th and U L
3
-edge XAFS data shows that the dominant structure in Th
1-
x
U
x
O
2+
y
is the mixture of ThO
2
component and local U
3
O
8
component. The extended X-ray adsorption fine structure (EXAFS) data of Th
0.8
U
0.2
O
2+
y
sample is further analyzed. The result shows that there is Th-U interaction in Th
0.8
U
0.2
O
2+
y
sample. The Th-U interaction results that the Th-Th/U bond length in Th
0.8
U
0.2
O
2+
y
slight shorter than that of pure ThO
2
and the U-O bond length in Th
0.8
U
0.2
O
2+
y
larger than that of pure U
3
O
8
.
Conclusion
2
The XAFS technique can supply complementary structure information of Th-U mixed oxides
such as the local structure of Th and U.
关键词
Keywords
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