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Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Ayame, Yasuo; Okamoto, Yoshihiro; Shiwaku, Hideaki; Matsuura, Haruaki*; Uchiyama, Takafumi*; Okada, Yukiko*; Nezu, Atsushi*; et al.
JAEA-Research 2016-015, 52 Pages, 2016/11
JAEA-Research-2016-015.pdf:37.48MB
The local structure of waste elements in simulated waste glasses including V was estimated by using synchrotron XAFS measurement in this study. The results are as follows. (1) V has a high possibility which exists in the glass phase in the case of frit, and V can regard both samples as stable 4 coordination structure. (2) Zn, Ce, Nd, Zr, and Mo exist in the glass phase, and the difference is admitted by the percentage of Ce(III) and Ce(IV) by the composition. (3) Ru is separated from the glass phase as RuO
crystalline, both of metal and oxide exist in Rh, and Pd is separated out as metal. (4) It was confirmed that the regularity of the local structure of Zr and Mo in the molten glasses retreats as a result of the XAFS measurement at high temperature. (5) The XAFS measurement of molten glasses were performed at 1200
C, so it would be possible to acquire excellent data by improving the shapes of the sample cell.
Akabori, Mitsuo; Takano, Masahide; Nakada, Masami; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*
no journal, ,
no abstracts in English
Nagayama, Sachiko; Okamoto, Yoshihiro; Shiwaku, Hideaki; Nakada, Masami; Akabori, Mitsuo; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*
no journal, ,
no abstracts in English
Okamoto, Yoshihiro; Nakada, Masami; Akabori, Mitsuo; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*; Nitani, Hiroaki*; Nomura, Masaharu*
no journal, ,
The molten state of simulated high-level waste glass and the behavior of ruthenium element in the melt were investigated by using synchrotron radiation based X-ray imaging technique. Melting, generating and moving of bubbles, condensation and sedimentation of ruthenium element were observed dynamically in continuous 12-bit gray-scale images from the CCD camera. The imaging XAFS results of our experiment clearly show that the ruthenium in the high temperature glass melt exists as oxide.
Okamoto, Yoshihiro; Shiwaku, Hideaki; Nagayama, Sachiko*; Nakada, Masami; Akabori, Mitsuo; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*
no journal, ,
no abstracts in English
Nakada, Masami; Nagayama, Sachiko*; Okamoto, Yoshihiro; Akabori, Mitsuo; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*
no journal, ,
no abstracts in English
Okamoto, Yoshihiro; Shiwaku, Hideaki; Nakada, Masami; Akabori, Mitsuo; Kawashima, Hidenori*; Komamine, Satoshi*; Ochi, Eiji*
no journal, ,
The EXAFS measurement of simulated waste glass prepared under several heating conditions were performed to clarify redox state of Ru, Rh and Pd elements. The EXAFS functions were fitted by linear combination of standard functions of pure metal and its oxide. A ratio of metallic and oxide components in the simulated glass was obtained from the fitting analysis. We proposed we could evaluate redox state in the process of glass melters.
Okamoto, Yoshihiro; Shiwaku, Hideaki; Nagai, Takayuki; Kobayashi, Hidekazu; Sasage, Kenichi; Kawashima, Hidenori*; Kakihara, Toshiaki*
no journal, ,
The vitrification technique is thought to be effective in immobilization of high-level radioactive liquid waste (HLLW). To the nuclear waste glass, higher waste loading and low leach rate are required. Synchrotron radiation based X-ray absorption fine structure (XAFS) analysis is useful to investigate the local coordination structure and chemical state of the FP component in the waste glass, since many kinds of elements more than 30 are contained in the glass. We have analyzed many glass samples by using JAEA beamline facility at the SPring-8, in conjunction with many coworkers. Since FY2016, we joined the Research and Development program for next generation reprocessing and vitrification technology carried out by assistance of Agency of Natural Resources and Energy (METI). Synchrotron radiation based XAFS work on the improvement activity of borosilicate glass system and substitute to iron phosphate glass system carried out in the program are introduced in this presentation.