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Journal Articles

Ion induced modifications of Mn-doped ZnO films

Matsunami, Noriaki*; Ito, M.*; Kato, M.*; Okayasu, Satoru; Sataka, Masao*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 365(Part A), p.191 - 195, 2015/12

https://doi.org/10.1016/j.nimb.2015.08.010

Times Cited Count：7 Percentile：44.25(Instruments & Instrumentation)

We have studied ion impact effects on atomic structure in terms of X-ray diffraction (XRD), optical absorption and electrical resistivity of Mn (6%)-doped ZnO films under 100 MeV Xe ion impact at room temperature. We find the monotonic reduction of the XRD intensity to 1/50 of that of unirradiated film at 5 10 $^{14}$ cm $^{-2}$ , little bandgap change (0.02 eV) and decrease of the resistivity by 4 order of magnitude. The resistivity modification has been compared with that by irradiations of low energy ions such as 100 keV Ne and N, which show more effective decrease of resistivity. We also find that temperature (T) dependence of the magnetic susceptibility () of Mn-doped ZnO follows the Curie law: = $_{o}$ + C/T (i.e., paramagnetic) and the Curie constant C decreases to a half of that before irradiation (C $_{O}$ = 0.012 emu cm $^{-3}$ K) at 100 MeV Xe ion fluence of 10 $^{12}$ cm $^{-2}$ .

Journal Articles

Electric installation at environment of nuclear fusion, 49; Development of radiation-resistant lighting

Okamura, Hiroki*; Tsuchida, Takashi*; Okada, Masao*; Yamagata, Ryohei; Seito, Hajime; Haruyama, Yasuyuki; Kaneko, Hirohisa

2011 Nen (Dai-29-Kai) Denki Setsubi Gakkai Zenkoku Taikai Koen Rombunshu, p.367 - 368, 2011/09

no abstracts in English

Journal Articles

Ion irradiation effects on tungsten-oxide films and charge state effect on electronic erosion

Matsunami, Noriaki*; Sataka, Masao*; Okayasu, Satoru; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3167 - 3170, 2010/10

https://doi.org/10.1016/j.nimb.2010.05.080

Times Cited Count：14 Percentile：63.91(Instruments & Instrumentation)

We have studied electronic- and atomic-structure modifications of polycrystalline WO $_{3}$ films (bandgap of 3 eV) by ion irradiation. WO $_{3}$ films were prepared by oxidation of W films on MgO substrates and of W sheets. We find disordering or amorphization, the lattice expansion of 1.5% and bandgap increase of 0.2 eV after 90 MeV Ni ion irradiation at 3 10 $^{12}$ cm $^{2}$ . A broad peak of optical absorption appears around 1.6 m by ion irradiation. We also find that the erosion yield by high-energy ions with the equilibrium charge exceeds 10 $^{4}$ and that the erosion yield under ion impact with non-equilibrium charge (90 MeV Ni $^{+10}$ ) is 1/5 of that with the equilibrium charge (89 MeV Ni $^{+19}$ ). Effects of depth dependence of the ion mean charge on the erosion yields are discussed. The erosion yield by low-energy ions is also presented.

Journal Articles

Electrical property modifications of In-doped ZnO Films by ion irradiation

Matsunami, Noriaki*; Fukushima, Junichi*; Sataka, Masao; Okayasu, Satoru; Sugai, Hiroyuki; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 268(19), p.3071 - 3075, 2010/10

https://doi.org/10.1016/j.nimb.2010.05.045

Times Cited Count：13 Percentile：61.31(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Spatial distribution of $^{14}$ C values of organic matter in surface sediments off Saru River in northern Japan, one year after a flood event in 2006

Nagao, Seiya*; Irino, Tomohisa*; Aramaki, Takafumi*; Ikehara, Ken*; Katayama, Hajime*; Otosaka, Shigeyoshi; Uchida, Masao*; Shibata, Yasuyuki*

Radiocarbon, 52(3), p.1068 - 1077, 2010/08

https://doi.org/10.1017/S0033822200046142

Times Cited Count：0 Percentile：0.00(Geochemistry & Geophysics)

This study discusses the effects of flooding on the spatial distribution of organic matter on the shelf region of off the Saru River, southern part of Hokkaido, Japan, on the basis of the $^{14}$ C and $^{13}$ C values. Surface sediments on the shelf were collected in August 2007, one year after the severe flood in 2006. Suspended particles and sediment of the Saru River were also collected in August 2007 and 2008. The $^{14}$ C values of organic matter in the shelf sediments ranged from -665 to -77 per mil. The silt and clay sediments had $^{14}$ C values of -240 to -77 per mil, but the sandy sediments ranged from -665 to -388 per mil. The values of particulate organic carbon in the Saru River are -292 to -247 per mil at normal flow conditions. These results indicate that surface soil with relatively older organic matter is deposited on the shelf region by the flooding event, and freshly-produced organic matter in sea surface is deposited after the flooding.

Journal Articles

Electronic and atomic structure modifications of copper nitride films by ion impact and phase separation

Matsunami, Noriaki*; Kakiuchida, Hiroshi*; Tazawa, Masato*; Sataka, Masao; Sugai, Hiroyuki; Okayasu, Satoru

Nuclear Instruments and Methods in Physics Research B, 267(16), p.2653 - 2656, 2009/08

https://doi.org/10.1016/j.nimb.2009.05.037

Times Cited Count：18 Percentile：71.58(Instruments & Instrumentation)

Journal Articles

Development of water-soluble chelate agent for trapping-heavy metal, 1

Mugibayashi, Yasuhiro*; Arimura, Juro*; Uchida, Toshihito*; Machiyama, Tomoaki*; Suzuki, Yoshio*; Seko, Noriaki; Tamada, Masao

JAEA-Review 2008-055, JAEA Takasaki Annual Report 2007, P. 41, 2008/11

https://jopss.jaea.go.jp/pdfdata/JAEA-Review-2008-055.pdf

no abstracts in English

Journal Articles

High-energy ion irradiation effects on atomic structures and optical properties of copper oxide and electronic sputtering

Matsunami, Noriaki*; Sataka, Masao; Okayasu, Satoru; Ishikawa, Norito; Tazawa, Masato*; Kakiuchida, Hiroshi*

Nuclear Instruments and Methods in Physics Research B, 266(12-13), p.2986 - 2989, 2008/06

https://doi.org/10.1016/j.nimb.2008.03.183

Times Cited Count：9 Percentile：51.29(Instruments & Instrumentation)

Irradiation effects of Cu $_{2}$ O irradiated with 100 MeV Xe ions were studied. X-ray diffraction intensity and optical properties were analyzed.

Journal Articles

Crystal-grain refinement of materials under an ultra-strong gravitational field

Iguchi, Yusuke*; Shibata, Yasuhiro*; Uchida, Yuta*; Huang, X.*; Ono, Masao; Okayasu, Satoru; Mashimo, Tsutomu

Advanced Materials Research, 15-17, p.639 - 642, 2007/00

https://doi.org/10.4028/www.scientific.net/AMR.15-17.639

Times Cited Count：2 Percentile：56.88(Thermodynamics)

In this study, we investigate the crystalline states and conditions for the grain-refinement of Bi $_{70}$ Sb $_{30}$ alloy. It was considered under an ultra strong gravity field, the crystals were fine-grained from the primary grain sizes of several mm to several tens of mm, and the crystal growth followed with formation of graded-composition structure due to sedimentation of atoms along the direction of gravity. It was found that for the crystal-grain refinement in Bi $_{70}$ Sb $_{30}$ alloy the minimum gravitational field and the minimum time duration were at least 160,000 G and 10 hours, respectively at about 200 $^{circ}$ C.

Journal Articles

SIMS analyses of SiO $_{2}$ /4H-SiC(0001) interface

Yamashita, Kenya*; Kitabatake, Makoto*; Kusumoto, Osamu*; Takahashi, Kunimasa*; Uchida, Masao*; Miyanaga, Ryoko*; Ito, Hisayoshi; Yoshikawa, Masahito

Materials Science Forum, 389-393, p.1037 - 1040, 2002/00

https://doi.org/10.4028/www.scientific.net/MSF.389-393.1037

Times Cited Count：3 Percentile：15.53(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Study on dynamics and sources of POC in river systems using 14C as a tracer

Nagao, Seiya*; Aramaki, Takafumi*; Irino, Tomohisa*; Uchida, Masao*; Shibata, Yasuyuki*; Togawa, Orihiko

no journal, ,

no abstracts in English

Oral presentation

Ion irradiation effects on copper-oxide(CuO) films

Matsunami, Noriaki*; Sakuma, Yasuhiro*; Sataka, Masao; Okayasu, Satoru; Kakiuchida, Hiroshi*

no journal, ,

no abstracts in English

Oral presentation

Modeling radio-nuclide behavior for estimating their amount in radioactive waste of Fukushima Daiichi NPS, 5; Evaluation of iodine chemical forms in the severe accident

Karasawa, Hidetoshi*; Chaki, Masao*; Uchida, Shunsuke*; Koma, Yoshikazu; Takahatake, Yoko

no journal, ,

no abstracts in English

Oral presentation

Modeling radio-nuclide behavior for estimating their amount in radioactive waste of Fukushima Daiichi NPS, 11; Evaluation of $^{137}$ Cs mass balance in the Unit 3

Uchida, Shunsuke*; Chaki, Masao*; Karasawa, Hidetoshi*; Koma, Yoshikazu; Takahatake, Yoko

no journal, ,

To estimate concentration rate of emitters in radwaste materials based on the transport ratios (TRs), it is essential subjects to provide the logical basis for providing the TRs to the target radwaste materials. Mass balance of $^{137}$ Cs in the plant, especially Unit 3, has been evaluated as a part of preparation the logical basis. The $^{137}$ Cs distribution was calculated by the forward evaluation procedures (FEP) based on the severe accident analysis code, while it was also obtained by the backward evaluation procedures (BEP) based on the measured dose rate data of CAMS as wells as the contaminated water data analysis. The mass balance of $^{137}$ Cs evaluated both from the FEP and BEP was introduced. The TRs of $^{90}$ Sr mainly in Unit 3 were also discussed.

Oral presentation

None

Koma, Yoshikazu; Chaki, Masao*; Murakami, Tadashi*; Uchida, Shunsuke*; Karasawa, Hidetoshi*; Hisada, Tsukasa*; Suzuki, Hiroyuki*; Sakurai, Kenta; Takahatake, Yoko; Oki, Keiichi

no journal, ,

no abstracts in English

Oral presentation