Chemical state analysis of high-temperature molten slag components by using high-energy XAFS

被引：4

作者：

Okamoto, Yoshihiro ^{[1
,3
]}

Osugi, Takeshi ^{[2
]}

Akabori, Mitsuo ^{[3
]}

Kobayashi, Tohru ^{[1
]}

Shiwaku, Hideaki ^{[1
]}

机构：

[1] Japan Atom Energy Agcy, Mat Sci Res Ctr, Kouto 1-1-1, Sayo, Hyogo 6795143, Japan

[2] Japan Atom Energy Agcy, Nucl Fuel Cycle Engn Labs, Muramatsu 4-33, Tokai, Ibaraki 3191194, Japan

[3] Japan Atom Energy Agcy, Collaborat Labs Adv Decommissioning Sci, Shirakata 2-4, Tokai, Ibaraki 3191195, Japan

来源：

JOURNAL OF MOLECULAR LIQUIDS | 2017年 / 232卷

关键词：

XAFS; Synchrotron radiation; Slag; High temperature liquid; NEAR-EDGE STRUCTURE; CERIUM; VALENCE; COORDINATION; EVOLUTION; SYSTEMS; EXAFS; XAS;

D O I：

10.1016/j.molliq.2017.02.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-energy XAFS measurement using cerium K-edge was performed to study the chemical state of cerium in high-temperature molten slag (SiO2-CaO-Fe2O3-CeO2). It was found from the change in the nearest Ce-0 distance obtained from EXAFS analysis and the energetic shift of the white line peak observed in XANES analysis that oxidation state of cerium was tetravalent in the molten state and trivalent in solid state. The Debye-Waller factor of the nearest Ce-O pair in solid slag was very large even at room temperature, and the change in its value upon heating and melting was very small. This result suggests that cerium is highly disordered and stable in solid slag. (C) 2016 Published by Elsevier B.V.

引用

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页码：285 / 289

页数：5

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