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Kusano, Kanya*; Ichimoto, Kiyoshi*; Ishii, Mamoru*; Miyoshi, Yoshizumi*; Yoden, Shigeo*; Akiyoshi, Hideharu*; Asai, Ayumi*; Ebihara, Yusuke*; Fujiwara, Hitoshi*; Goto, Tadanori*; et al.
Earth, Planets and Space (Internet), 73(1), p.159_1 - 159_29, 2021/12
Times Cited Count：6 Percentile：49.29(Geosciences, Multidisciplinary)The PSTEP is a nationwide research collaboration in Japan and was conducted from April 2015 to March 2020, supported by a Grant-in-Aid for Scientific Research on Innovative Areas from the Ministry of Education, Culture, Sports, Science and Technology of Japan. It has made a significant progress in space weather research and operational forecasts, publishing over 500 refereed journal papers and organizing four international symposiums, various workshops and seminars, and summer school for graduate students at Rikubetsu in 2017. This paper is a summary report of the PSTEP and describes the major research achievements it produced.
Hashinokuchi, Michihiro*; Sumimoto, Yuichi*; Tode, Mayumi; Harries, J.; Okada, Michio*; Teraoka, Yuden; Kasai, Toshio*
Denki Gakkai Rombunshi, C, 130(10), p.1723 - 1729, 2010/10
The oxidation processes on a TiAl surface induced by a hyperthermal O
molecular beam (HOMB) with a translational energy of 2.2 eV was studied by X-ray photoemission spectroscopy in conjunction with synchrotron radiation. At a surface temperature of 300 K, the simultaneous growth of Al and Ti oxides accompanied with the segregation of AlO
near the surface was observed. The efficiency of oxidation for the HOMB incidence was smaller than that for O backfilling (25 meV). Furthermore, the chemical compositions of oxide species (AlO, TiO, TiO) on the TiAl surface were independent of the translational energy of incident O molecule. The present results suggest that the oxidation on TiAl surface proceeds via precursor molecular states.
Hashinokuchi, Michihiro*; Sumimoto, Yuichi; Tode, Mayumi; Okada, Michio*; Harries, J.; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*
no journal, ,
We have studied chemical reactions of TiAl surface with oxygen molecules by using synchrotron radiation photoelectron spectroscopy to clarify the generation process of Al oxides. The experiment was conducted with the surface chemistry experimental station (SUREAC2000) at the soft X-ray beamline (BL23SU) of Japan Atomic Energy Agency in the SPring-8 facilities. The surface (50at.%) was cleaned by Ar
ion sputtering and annealing. Comparing the Al-2p and Ti-2p XPS spectra of the clean surface with those of the surface exposed to the oxygen of 350L at 673K, it has been found that the peak position and profile were changed. It shows that both Ti and Al atoms were oxidized. Moreover, the Ti oxides was decreased by heating up to 1123K.
Hashinokuchi, Michihiro*; Sumimoto, Yuichi; Tode, Mayumi; Harries, J.; Teraoka, Yuden; Okada, Michio*; Kasai, Toshio*
no journal, ,
The oxidation processes on TiAl are complex and the composition of the oxide layer depends on various oxidation parameters like sample temperature and oxygen pressure. Therefore, the aim of this work was to examine the initial stages of oxidation of TiAl under different oxidation temperatures and the different kinetic energy of incident oxygen by using X-ray photoemission spectroscopy in conjunction with synchrotron radiation. All experiments were performed with a surface reaction analysis apparatus (SUREAC2000) constructed in BL23SU at SPring-8. The TiAl sample was cleaned by repeatedly argon ion sputtering and annealing. The Oxygen molecules were dosed on the TiAl by hyperthermal oxygen molecular beams or by backfilling oxygen gas.
Hashinokuchi, Michihiro*; Sumimoto, Yuichi; Tode, Mayumi; Harries, J.; Okada, Michio*; Teraoka, Yuden; Kasai, Toshio*
no journal, ,
Titanium-based intermetallic alloys have attracted great attention as hydrogen storage materials. However, the oxide layer formed on the surface, which reduces the initial activation, has come to an issue. Therefore, improvements on the composition and structure in oxide layer are required. In this study, we investigated the oxidation on TiAl intermetallic alloys by hyperthermal Oxygen molecular beam (HOMB) and X-ray photoemission spectroscopy in conjunction with synchrotron radiation (SR-XPS).
Hashinokuchi, Michihiro*; Sumimoto, Yuichi*; Tode, Mayumi; Okada, Michio*; Harries, J.; Teraoka, Yuden; Kasai, Toshio*
no journal, ,
The oxidation processes on a TiAl surface induced by a hyperthermal O molecular beam (HOMB) with a translational energy of 2.2 eV was studied by X-ray photoemission spectroscopy in conjunction with synchrotron radiation. At a surface temperature of 300 K, the simultaneous growth of Al and Ti oxides accompanied with the segregation of AlO near the surface was observed. The efficiency of oxidation for the HOMB incidence was smaller than that for O backfilling (25 meV). Furthermore, the chemical compositions of oxide species (AlO, TiO, TiO) on the TiAl surface were independent on the translational energy of incident O molecules. The present results suggest that the oxidation on a TiAl surface proceed via molecular adsorption as a precursor state.
Hashinokuchi, Michihiro*; Sumimoto, Yuichi*; Tode, Mayumi; Harries, J.; Okada, Michio*; Teraoka, Yuden; Kasai, Toshio*
no journal, ,
The oxidation processes on a TiAl surface induced by a hyperthermal O molecular beam (HOMB) with a translational energy of 2.2 eV was studied by X-ray photoemission spectroscopy in conjunction with synchrotron radiation. At a surface temperature of 300 K, the simultaneous growth of Al and Ti oxides accompanied with the segregation of AlO near the surface was observed. The efficiency of oxidation for the HOMB incidence was smaller than that for O backfilling (25 meV). Furthermore, the chemical compositions of oxide species (AlO, TiO, TiO) on the TiAl surface were independent on the translational energy of incident O molecule. The present results suggest that the oxidation on TiAl surface proceed via precursor molecular states.
Tsuchiya, Mayumi*; Kasai, Megumi*; Abe, Jun*; Kanazawa, Akira*; Nozawa, Shigeki; Hase, Yoshihiro; Narumi, Issei
no journal, ,
no abstracts in English
