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Baba, Yuji; Shimoyama, Iwao
no journal, ,
no abstracts in English
fullerene absorbent for Cs-135 isotope separation, studied by photoelectron spectroscopySekiguchi, Tetsuhiro; Yokoyama, Keiichi; Uozumi, Yuki*; Yano, Masahiro; Asaoka, Hidehito; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
For nuclear transmutation of cesium-135 (Cs-135), which is long-lived fission product, we are developing selective absorbent which takes only Cs atom in, but does not CsI. In this study, absorbing property of Cs atom or CsI into fullerene (C) solid has been investigated using synchrotron-based angle-dependent X-ray photoelectron spectroscopy (ARXPS). It was found that Cs penetrates into C deep bulk. In contrast, CsI does not diffuse into bulk, although CsI over-layer was formed on the shallow surface. Furthermore, XPS spectra were measured as a function of Ar
-sputtering time in order to know Cs concentration profiles in further deep region. Results showed that Cs penetrates into deep region of several hundreds 
.
Okamoto, Yoshihiro; Nagai, Takayuki; Kobayashi, Hidekazu; Shiwaku, Hideaki; Sato, Nobuaki*
no journal, ,
X-ray absorption fine structure (XAFS) analyses were performed to elucidate for simulated high level liquid waste (HLLW) and its powder samples obtained by heating up to 800
C. The purpose of this work is to elucidate chemical state of each element in the samples when the HLLW components mix with borosilicate glass. In the present work, a simulated HLLW equivalent to the HLLW stored in the JAEA Tokai Vitrification Facility (TVF) was used to evaluate the chemical state of Cr, Mn, Fe, Zr, Mo, Ru, Rh, Pd and Ce elements. As the results of XAFS data analysis of cerium L
-edge, it was revealed that oxidation state of cerium in the simulated HLLW was trivalent but changed to tetravalent (chemical form is CeO
) at 400C. The molybdate ion (MoO
)
, which is generally observed in the waste glass form, was found in the powder sample after heating to 500C. In addition to heating temperature from 100C to 800C, influence of atmosphere at the heating (in air and in argon) was evaluated in the present work.
Shobu, Takahisa; Yasuda, Ryo*; Shiro, Ayumi*; Yoshida, Yutaka*; Tokuda, Susumu*; Shibano, Junichi*; Kumagai, Masayoshi*
no journal, ,
A dislocation density increases and fatigue failure of the structure occur, when a metal is deformed. In this study, dislocation density of a broken 0.3 mm thick SUS316L specimen was calculated by line profile analysis obtained by high energy synchrotron X-ray diffraction method, and a relationship between fatigue fracture and dislocation density was evaluated. As a result of the analysis, it was revealed that the dislocation density abruptly increases as approaching the fracture part. In addition, it was revealed that the bcc structure appeared in the fcc structure which is the basic structure in the fracture part. In steel, the increase in dislocation density is closely related to the increase in material strength, and the material strength of steel with bcc structure is known to be higher than that with fcc structure. So, it seems that the structure has changed due to a sharp increase in dislocation density at the fracture part.
Ikeura, Hiromi*; Sekiguchi, Tetsuhiro
no journal, ,
A metal complex having dithiolene as a ligand, which is known as a non-inocentric ligand, is a complex electronic system composed of p
-electrons of a ligand and d-electrons of a central metal ion. Since it shows unique properties, a huge number of researches on such complexes have been carried out. Complex electron systems are attracting strong attention in aiming at practical use such as functional materials. In this study, to investigate the electronic state of the dithiolene type ligand, experiments were conducted using sulfur K-shell X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy, and resonant Auger electron spectroscopy (RAS). In XAS, in some systems a broadened peak is observed and can not be separated by the XAS method alone. It was found that peak separation may be possible by assist of RAS result. We discuss the assignment on the transition of XAS process of materials on the basis of both XAS and RAS.
Yoneda, Yasuhiro
no journal, ,
An invitation lecture about atomic pair distribution function (PDF) method which is one of the local structural analysis method using synchrotron radiation X-rays was performed. Since the PDF analysis can be clarified the nano-scale order structure, as well as the short-range order structure, the PDF analysis is structural analysis method indispensable to ferroelectric materials with a manifested organization of physical properties through the domain. I showed that the results of the PDF analysis for relaxor ferroelectrics. The PDF is able to visualize the structure of the lead atoms, which deviates from the average structure.