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Fujita, Naoki*; Kosugi, Shinya*; Zushi, Yoshihiro*; Matsui, Toshiyuki*; Saito, Yuichi; Iwase, Akihiro*
Nuclear Instruments and Methods in Physics Research B, 267(6), p.921 - 924, 2009/04
Times Cited Count：9 Percentile：53.42(Instruments & Instrumentation)
by means of synchrotron radiation X-ray photoelectron spectroscopyIwase, Akihiro*; Ono, Hirotaka*; Ishikawa, Norito; Baba, Yuji; Hirao, Norie; Sonoda, Takeshi*; Kinoshita, Motoyasu*
Nuclear Instruments and Methods in Physics Research B, 267(6), p.969 - 972, 2009/03
Times Cited Count：37 Percentile：91.03(Instruments & Instrumentation)To study the effects of swift heavy ion irradiation on cerium dioxide (CeO), CeO sintered pellets were irradiated with 200 MeV Xe ions at room temperature. For irradiated and unirradiated samples, the spectra of X-ray photoelectron spectroscopy (XPS) were measured. XPS spectra for the irradiated samples show that the valence state of Ce atoms partly changes from +4 to +3. The amount of Ce
state was quantitatively obtained as a function of ion-fluence. The relative amount of oxygen atom displacements, which are accompanied by the decrease in Ce valence state, is 3-5%. This value is too large to be explained in terms of elastic interactions between CeO and 200 MeV ions. The experimental result suggests the contribution of 200 MeV Xe induced electronic excitation to the displacements of oxygen atoms.
Kinoshita, Motoyasu; Yasunaga, Kazufumi*; Sonoda, Takeshi*; Iwase, Akihiro*; Ishikawa, Norito; Sataka, Masao; Yasuda, Kazuhiro*; Matsumura, Sho*; Geng, H. Y.*; Ichinomiya, Takashi*; et al.
no journal, ,
We show the outline of achievements of New Cross Over (NXO) project. Concerning the grain subdivision of ceramics fuel at high burnup, we are trying to clarify the mechanisms and to develop the simulation methods. The main high lights are as follow as: (1) We have reproduced the grain subdivision of CeO, by means of ion implanter and TUNDEM accelerator. (2) We performed computational science study concerning the relocation of oxygen. In case of oxygen exess conditions, first principal calculation reproduced the orderring structure. TAD calculation shows that the exess oxygen compose clusters and diffuses rapidly even if low temperature.
by means of syncrotron radiation X-ray photoelectron spectroscopy and Ce K-edge EXAFS spectroscopyIwase, Akihiro*; Ono, Hirotaka*; Matsumura, Daiju; Nishihata, Yasuo; Mizuki, Junichiro; Ishikawa, Norito; Baba, Yuji; Hirao, Norie; Sonoda, Takeshi*; Kinoshita, Motoyasu*
no journal, ,
To study the effects of swift heavy ion irradiation in cerium dioxide, the samples were irradiated with 200MeV Xe. The irradiated samples were analyzed by EXAFS measurement and XPS measurement.
