Study on the microstructure of Th1-<italic style="font-style: italic">x</italic>U<italic style="font-style: italic">x</italic>O2+<italic style="font-style: italic">y</italic> by synchrotron radiation XAFS technique

Chunyu XIE; Hanjie CAO; Zenghui YUE; Hongliang BAO; Jianqiang WANG

doi:10.11889/j.0253-3219.2018.hjs.41.070102

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Study on the microstructure of Th_1-xU_xO_2+y by synchrotron radiation XAFS technique

SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS | 更新时间：2021-05-19

- Study on the microstructure of Th_1-xU_xO_2+y by synchrotron radiation XAFS technique
- NUCLEAR TECHNIQUES Vol. 41, Issue 7, Article number: 070102(2018)
- 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：
- 基金信息：
  
  National Natural Science Foundation of China;National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.070102
  CLC： TL99
- Received：17 March 2018，
  
  Revised：23 April 2018，
  
  Published：10 July 2018
- 稿件说明：
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Chunyu XIE, Hanjie CAO, Zenghui YUE, et al. Study on the microstructure of Th_1-xU_xO_2+y by synchrotron radiation XAFS technique[J]. Nuclear techniques, 2018, 41(7): 070102
DOI：

Chunyu XIE, Hanjie CAO, Zenghui YUE, et al. Study on the microstructure of Th_1-xU_xO_2+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

混合氧化物样品的钍和铀的局域结构。Th和U的L

边XAFS实验数据表明：Th

的主导结构是ThO

成分与局域U

成分的微观混合。对Th

0.8

0.2

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

成分的Th-Th/U键长与纯ThO

相比缩短0.003 nm，同时，局域U

成分的平均U-O键长与纯U

相比增加约0.01 nm。

Abstract

Background

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

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

The local structures of Th and U in as-prepared Th

samples are obtained by XAFS spectroscopy technique.

Results

The Th and U L

-edge XAFS data shows that the dominant structure in Th

is the mixture of ThO

component and local U

component. The extended X-ray adsorption fine structure (EXAFS) data of Th

0.8

0.2

sample is further analyzed. The result shows that there is Th-U interaction in Th

0.8

0.2

sample. The Th-U interaction results that the Th-Th/U bond length in Th

0.8

0.2

slight shorter than that of pure ThO

and the U-O bond length in Th

0.8

0.2

larger than that of pure U

Conclusion

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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Study on the microstructure of Th1-xUxO2+y by synchrotron radiation XAFS technique

DOI：10.11889/j.0253-3219.2018.hjs.41.070102

摘要

Abstract

关键词

Keywords

references

Study on the microstructure of Th_1-xU_xO_2+y by synchrotron radiation XAFS technique