Chemical state analysis of rhodium in simulated waste glass by synchrotron-radiation-based XAFS and imaging XAFS techniques

Okamoto, Yoshihiro ; Nagai, Takayuki ; Shiwaku, Hideaki ; Inose, Takehiko*; Sato, Seiichi*

X-ray absorption fine structure (XAFS) and imaging XAFS analyses were performed to elucidate chemical state of rhodium in the simulated waste glass. The chemical forms of Rh in the glass were evaluated to be 84% RhO $_{2}$ and 16% metal/alloy as the result of linear combination analysis of EXAFS data. According to the imaging XAFS analysis, the chemical form of Rh which was located together with Ru was mainly oxide (RhO $_{2}$ ). It suggests that stable (Ru,Rh)O $_{2}$ solid solution exists in the simulated glass. On the other hand, that of Rh of which distribution did not accord with Ru in the glass was mainly metallic. In the case of metallic Rh in the glass, it tended to become an aggregation form. It can be concluded that the chemical state of Rh was much affected by the existence and distribution of Ru element.

Language	:	Japanese
Journal	:	Nihon Genshiryoku Gakkai Wabun Rombunshi
Volume	:	16
Number	:	4
Pages	:	p.180 - 190
Publication Year/Month	:	2017/12
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Paper URL	:	https://doi.org/10.3327/taesj.J16.024
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Keywords	:	イメージング; XAFS; 放射光; ガラス固化体; 白金族元素
Research Facility	:	SPring-8(大型放射光施設)
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Article of JAEA R&D Review	:	Clarifying the Chemical State of Platinum-Group Elements in Borosilicate Glass; Advanced Analysis of Correlations between Constituent Elements Using Imaging XAFS[/]
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Registration No. : AA20170196
JAEA Abstracts No. : 46000166
Paper Submission No. : 19795

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