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Matsumura, Daiju; Kimura, Yusaku*; Tsuji, Takuya; Mizuki, Junichiro*
SPring-8/SACLA Riyo Kenkyu Seikashu (Internet), 11(5), p.296 - 299, 2023/11
no abstracts in English
observation of surface reactions under the gas atmosphere; History, applications, issues, and future prospectTakakuwa, Yuji*; Ogawa, Shuichi*; Yoshigoe, Akitaka
Hoshako, 35(3), p.158 - 171, 2022/05
Ambient pressure X-ray photoelectron spectroscopy for in situ observation of surface reactions using high-brightness synchrotron radiation shows a rapid progress in the number of endstations since about 2005 and is applied to various practical research field for clarifying reactions at solid/gas interfaces of e.g. catalyst, solid/liquid interfaces of e.g. fuel cell, and gas/liquid interfaces of e.g. ion liquid. In this review, a history of the development of APXPS, real-time observation of the surface reactions for Si chemical vapor deposition and Si dry oxidation, issues of APXPS, and future prospects are described.
Ogawa, Shuichi*; Yoshigoe, Akitaka; Tang, J.*; Sekihata, Yuki*; Takakuwa, Yuji*
Japanese Journal of Applied Physics, 59(SM), p.SM0801_1 - SM0801_42, 2020/07
Times Cited Count：5 Percentile：33.01(Physics, Applied)In this paper, we review the study of the unified Si oxidation reaction model mediated by point defect generation, in which O
dissociative adsorption occurs at dangling bonds of point defects (emitted Si atoms and vacancies) at the SiO/Si interface, and the point defect generation rate is given by a combination of oxidation-induced strain, thermal strain due to the difference in thermal expansion coefficient between Si and SiO, thermal excitation of Si emission rate, and heat of adsorption.
Sakamoto, Tomokazu*; Kishi, Hirofumi*; Yamaguchi, Susumu*; Matsumura, Daiju; Tamura, Kazuhisa; Hori, Akihiro*; Horiuchi, Yosuke*; Serov, A.*; Artyushkova, K.*; Atanassov, P.*; et al.
Journal of the Electrochemical Society, 163(10), p.H951 - H957, 2016/08
Times Cited Count：30 Percentile：76.46(Electrochemistry)Sakamoto, Tomokazu*; Matsumura, Daiju; Asazawa, Koichiro*; Martinez, U.*; Serov, A.*; Artyushkova, K.*; Atanassov, P.*; Tamura, Kazuhisa; Nishihata, Yasuo; Tanaka, Hirohisa*
Electrochimica Acta, 163, p.116 - 122, 2015/05
Times Cited Count：57 Percentile：82.8(Electrochemistry)Machida, Masahiko; Nakamura, Hiroki; Srinivasan, S. G.*; Van Duin, A. C. T.*
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 4 Pages, 2015/05
Zircalloy has been widely employed as an excellent material covering the fuel rod. The mechanical and thermal properties have been explored by various experiments. In terms of its use as the fuel cladding, its response to oxidation reactions is an important topic when it is exposed to high temperature and high pressure steam during severe accidents. Especially, the hydrogen production accompanied by the oxidation is critical because it can lead to the crisis of the hydrogen explosion, as observed in the Fukushima Nuclear Power Plant accidents. Silicon carbide (SiC) has been considered as an alternative cladding material owing to an advantage that hydrogen production is much suppressed in the equivalent condition compared to Zircalloy. Therefore, we simulate the oxidation reaction for both materials, i.e. Zirconium metal and SiC in atomistic level by using the ReaxFF reactive force field method to simulate the chemical reaction molecular dynamics. Through such comparative studies between Zirconium and SiC in the same condition, we clarify how the temperature and the steam pressure accelerates the oxidation reaction and the resultant hydrogen production in both materials at typical severe accident conditions. The advantage using ReaxFF is that it allows us to directly trace the oxygen diffusion inside the Zirconium metal and SiC depending on the temperature and vapor pressure together with the oxidation reaction. We can compare the reaction processes in both materials. Especially, we paid attention to the rate of hydrogen production in both materials.
synchrotron radiation photoelectron spectroscopy study of the oxidation of the Ge(100)-2
1 surface by supersonic molecular oxygen beamsYoshigoe, Akitaka; Teraoka, Yuden; Okada, Ryuta; Yamada, Yoichi*; Sasaki, Masahiro*
Journal of Chemical Physics, 141(17), p.174708_1 - 174708_7, 2014/11
Times Cited Count：8 Percentile：29.76(Chemistry, Physical)
synchrotron radiation photoelectron spectroscopy was performed during the oxidation of the Ge(100)-21 surface induced by a molecular oxygen beam with various incident energies up to 2.2 eV from the initial to saturation coverage of surface oxides. The saturation coverage of oxygen on the clean Ge(100) surface was much lower than one monolayer and the oxidation state of Ge was +2 at most. This indicates that the Ge(100) surface is in strong contrast to Si surfaces. The direct adsorption process can be activated by increasing the translational energy, resulting in an increased population of Ge
and a higher final oxygen coverage. Our findings will contribute to the fundamental understanding of oxygen adsorption processes at 300 K from the initial stages to saturated oxidation.
Taguchi, Mitsumasa; Kojima, Takuji
Radiation Research, 163(4), p.455 - 461, 2005/04
Times Cited Count：25 Percentile：57.4(Biology)no abstracts in English
Taguchi, Mitsumasa; Kojima, Takuji
JAERI-Review 2004-025, TIARA Annual Report 2003, p.139 - 140, 2004/11
no abstracts in English
contained in Ar purgeAlvani, C.*; Casadio, S.*; Contini, V.*; Giorgi, R.*; Mancini, M. R.*; Pierdominici, F.*; Salernitano, E.*; Tsuchiya, Kunihiko; Kawamura, Hiroshi; Stijkel, M. P.*; et al.
JAERI-Conf 2004-012, p.148 - 162, 2004/07
no abstracts in English
Iwase, Masanori*
JNC TJ8400 2000-063, 78 Pages, 2000/03
JNC-TJ8400-2000-063.pdf:1.93MB
This study is aimed at controlling oxidation reaction of molten metal by ash in incineration systems, and at positively utilizing the oxidation reaction for decontamination of slag. In this year, in order to investigate physico-chemical properties of mixed fused salt containing alkali sulfates, with special focus on the behaviour of oxygen anion in the melts, Cu / Cu
redox equilibrium experiments were carried out. Among the effect of various parameters on Cu / Cu ratio in binary and ternary alkali sulfate melts, the effect of partial pressures of oxygen and SO was mainly investigated in the study. Variation in Cu / Cu ratio were presented as the function of partial pressures of oxygen and SO, respectively. Possible thermodynamic interpretation were made on the experimental results. In addition, the dissolution of CrO
in mixed alkali sulfates were also investigated as a first step to elucidate the mechanism of hot corrosion. With this investigation, an important finding was obtained that the solubility of CrO for melts with same average ionic radius, in other words, oxygen ion activity, were essentially identical under constant temperature and atmosphere.
Ichinose, Yuji; *; Kawanishi, Shunichi; *; *
Langmuir, 13(10), p.2603 - 2605, 1997/00
Times Cited Count：8 Percentile：45.43(Chemistry, Multidisciplinary)no abstracts in English
removal from flue gas by electron beam techniqueH.Maetzing*; Namba, Hideki; Tokunaga, Okihiro
Radiation Physics and Chemistry, 42(4-6), p.673 - 677, 1993/00
Times Cited Count：15 Percentile：79.5(Chemistry, Physical)no abstracts in English
Tagawa, Hiroaki; Fujino, Takeo; *; *; *
Bulletin of the Chemical Society of Japan, 54(1), p.138 - 142, 1981/00
Times Cited Count：15 Percentile：69.29(Chemistry, Multidisciplinary)no abstracts in English
O
Fujino, Takeo; *;
Journal of Nuclear Materials, 97, p.93 - 103, 1981/00
Times Cited Count：18 Percentile：87.29(Materials Science, Multidisciplinary)no abstracts in English
; Shimizu, Toku; ; ; Naruse, Yuji
Nihon Genshiryoku Gakkai-Shi, 23(12), p.923 - 929, 1981/00
Times Cited Count：3 Percentile：45.64(Nuclear Science & Technology)no abstracts in English
; ; ; ;
Tanso, (105), p.45 - 51, 1981/00
no abstracts in English
