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Journal Articles

Experimental evidence of crystalline hillocks created by irradiation of CeO$$_{2}$$ with swift heavy ions; TEM study

Ishikawa, Norito; Okubo, Nariaki; Taguchi, Tomitsugu

Nanotechnology, 26(35), p.355701_1 - 355701_8, 2015/09

 Times Cited Count:6 Percentile:54.42(Nanoscience & Nanotechnology)

In this study, CeO$$_{2}$$ was irradiated with 200 MeV Au ions at oblique incidence. Observation of as-irradiated samples by transmission electron microscope (TEM) shows that hillocks are created not only at the wide surfaces, but also at the crack faces of the thin samples. Since the hillocks created at the crack faces can be imaged by TEM, their shape and crystallographic features can be revealed. From the images of hillocks created at the crack faces, many of the hillocks are found to be spherical. We present a first experimental evidence that hillocks created for CeO$$_{2}$$ irradiated with swift heavy ions have a crystal structure whose lattice spacing and orientation coincide with those of the matrix. The mechanism of spherical crystalline hillock formation is discussed based on the present results.

Journal Articles

Material issues relating to high power spallation neutron sources

Futakawa, Masatoshi

IOP Conference Series; Materials Science and Engineering, 74(1), p.012001_1 - 012001_7, 2015/02

 Times Cited Count:1 Percentile:31.89

Innovative researches using neutrons are being performed at the Materials and Life Science Experimental Facility, MLF, at the Japan Proton Accelerator Research Complex, J-PARC, in which a mercury target system is installed for MW-class pulse spallation neutron sources. The structural materials of the mercury target are subjected to irradiation damage due to protons and neutrons, very high cycle fatigue damages due to repeated pressure waves caused by the proton beam bombardment in mercury and so-called liquid metal embrittlement. That is, the structural materials must be said to be exposed to the extremely severe environments. In the paper, research and development relating to the material issues in the high power spallation neutron sources that has been performed so far at J-PARC is summarized.

Journal Articles

Primary radiation damage in materials

Nordlund, K.*; Sand, A. E.*; Granberg, F.*; Zinkle, S. J.*; Stoller, R.*; Averback, R. S.*; Suzudo, Tomoaki; Malerba, L.*; Banhart, F.*; Weber, W. J.*; et al.

NEA/NSC/DOC(2015)9 (Internet), 86 Pages, 2015/00

Within this report, we review the current understanding of primary radiation damage from neutrons, ions and electrons with emphasis on the range of validity of the dpa concept in all main classes of materials, and in particular discuss known shortcomings. We recognise that the current NRT-dpa standard is fully valid in the sense of a scaled radiation exposure measure, as it is essentially proportional to the radiation energy deposited per volume. As such, it is highly recommended to be used in reporting neutron damage results to enable comparison between different nuclear reactor environments and ion irradiations. However, in the sense of a measure of damage production the NRT-dpa value has several well-known problems. We discuss this matter and propose an improved dpa definition.

Journal Articles

Self-radiation effects and glassy nature of magnetic transition in AmO$$_2$$ revealed by $$^{17}$$O-NMR

Tokunaga, Yo; Nishi, Tsuyoshi; Nakada, Masami; Ito, Akinori*; Sakai, Hironori; Kambe, Shinsaku; Homma, Yoshiya*; Honda, Fuminori*; Aoki, Dai*; Walstedt, R. E.*

Physical Review B, 89(21), p.214416_1 - 214416_8, 2014/06

 Times Cited Count:6 Percentile:58.6(Materials Science, Multidisciplinary)

The magnetic phase transition near $$T_0=8.5$$ K in AmO$$_2$$ has been investigated microscopically by means of $$^{17}$$O NMR. To avoid complexities arising from sample aging associated with the alpha decay of $$^{243}$$Am, all measurements have been performed within 40 days after sample synthesis. Even during such a short period, however, a rapid change of NMR line shape has been observed at 1.5 K, suggesting that the ground state of AmO$$_2$$ is very sensitive to disorder. We have also confirmed the loss of $$^{17}$$O NMR signal intensity over a wide temperature range below $$T_0$$, and more than half of oxygen nuclei are undetectable at 1.5 K. This behavior reveals the persistence of slow and distributed spin fluctuations down to temperatures well below $$T_0$$. In the paramagnetic state, strong NMR line broadening and spatially inhomogeneous spin fluctuations have been observed. The results are all indicative of short-range, spin-glass-like character for the magnetic transition in this system.

Journal Articles

Effect of ion irradiation and implantation of H and He on the corrosion behavior of austenitic stainless steel

Nemoto, Yoshiyuki; Miwa, Yukio; Kaji, Yoshiyuki; Tsukada, Takashi

Journal of Nuclear Materials, 343(1-3), p.313 - 317, 2005/08

 Times Cited Count:2 Percentile:79.3(Materials Science, Multidisciplinary)

The aim of this work is to evaluate corrosion behavior of irradiated materials these would be used in spallation neutron sources. Solution annealed high purity Fe-18Cr-12Ni specimens were used in this study. Ni$$^{3+}$$, H+ and He$$^{2+}$$ ions were irradiated at 473 to 773K. After corrosion procedure, the specimens were examined with atomic force microscope (AFM) to evaluate corrosion behavior. It was shown that the corroded volume of irradiated area increased with radiation damage. Higher H content at lower temperature accelerated corrosion, but H at higher temperature did not accelerate corrosion. He suppressed corrosion, and corroded volume was larger for the specimens irradiated at higher temperature than these at lower temperature. It is suggested from this study that H and He affect the corrosion behavior of irradiated alloy.

Journal Articles

Fusion blanket construction

Konishi, Satoshi*; Kimura, Akihiko*; Akiba, Masato; Nakamura, Hiroo; Nagasaka, Takuya*; Muroga, Takeo*; Hasegawa, Akira*; Matsui, Hideki*

Nippon Genshiryoku Gakkai-Shi, 46(5), p.311 - 322, 2004/05

no abstracts in English

Journal Articles

Evaluation of corrosion behavior of ion irradiated stainless steel using atomic force microscope

Nemoto, Yoshiyuki; Miwa, Yukio; Tsuji, Hirokazu; Tsukada, Takashi

Nippon AEM Gakkai-Shi, 11(4), p.242 - 248, 2003/12

no abstracts in English

Journal Articles

Radiation damage on 6H-SiC Schottky diodes

Nishijima, Toshiji*; Hearne, S. M.*; Jamieson, D. N.*; Oshima, Takeshi; Lee, K. K.; Ito, Hisayoshi

Nuclear Instruments and Methods in Physics Research B, 210, p.196 - 200, 2003/09

 Times Cited Count:1 Percentile:86.11

The radiation damage in silicon carbide (SiC) schottky diode was studied using ion beam induced current (IBIC). Schottky diodes with electrodes of 30 $$mu$$m on n- or p-type 6H-SiC were fabricated using the evaporation of Al, Ni, and Au. To study the radiation damage of diodes, the 2MeV-He ion micro beam with a diameter of 1 $$mu$$m was irradiated from 10$$^{9}$$ to 10$$^{13}$$/cm$$^{2}$$ into a 10 $$mu$$m $$times$$ 10 $$mu$$m area. As the result, the value of IBIC decreased with increasing the dose of 2 MeV-He. This indicates that the charge collection decreases by the recombination centers introduced by irradiation.

Journal Articles

Evaluation of hardening behavior of ion irradiated reduced activation ferritic/martensitic steels by an ultra-micro-indentation technique

Ando, Masami; Tanigawa, Hiroyasu; Jitsukawa, Shiro; Sawai, Tomotsugu; Kato, Yudai*; Koyama, Akira*; Nakamura, Kazuyuki; Takeuchi, Hiroshi

Journal of Nuclear Materials, 307-311(Part1), p.260 - 265, 2002/12

 Times Cited Count:30 Percentile:11.02

no abstracts in English

Journal Articles

5th International Workshop on Spallation Materials Technology

Kikuchi, Kenji

Nippon Genshiryoku Gakkai-Shi, 44(8), p.622 - 623, 2002/08

no abstracts in English

Journal Articles

Investigation of the radiation hardness on semiconductor devices using the ion micro-beam

Nishijima, Toshiji*; Oshima, Takeshi; Lee, K. K.

Nuclear Instruments and Methods in Physics Research B, 190(1-4), p.329 - 334, 2002/05

 Times Cited Count:10 Percentile:40.03

no abstracts in English

Journal Articles

The State and trend of IASCC study

Tsukada, Takashi

Nippon Yosetsu Kyokai "Genshiryoku Kozo Kiki No Zairyo, Sekkei, Seko, Kensa Ni Kansuru Koshukai" Tekisuto, 40 Pages, 2002/00

no abstracts in English

Journal Articles

Radiation defects in nano-structured materials

Otsuka, Hideo; Hojo, Kiichi; Maeta, Hiroshi*; Otsu, Hitoshi; Sugai, Hiroyuki; Yamamoto, Hiroyuki

European Physical Journal D, 16(1-3), p.309 - 311, 2001/09

no abstracts in English

Journal Articles

Irradiated damage in high-Tc superconductor

Sasase, Masato; Okayasu, Satoru; Kurata, Hiroki; Hojo, Kiichi

Physica C, 357-360(Part.1), p.497 - 500, 2001/09

no abstracts in English

Journal Articles

Observation of radiation damage induced by single-ion hits at the heavy ion microbeam system

Kamiya, Tomihiro; Sakai, Takuro; Hirao, Toshio; Oikawa, Masakazu*

Nuclear Instruments and Methods in Physics Research B, 181(1-4), p.280 - 285, 2001/07

 Times Cited Count:2 Percentile:76.71

no abstracts in English

Journal Articles

Aging degradation of light water reactor materials; Reactor internal and pressure vessel materials

Tsukada, Takashi; Ebine, Noriya

Nippon AEM Gakkai-Shi, 9(2), p.171 - 177, 2001/06

no abstracts in English

JAEA Reports

An Irradiation test of heat-resistant ceramic composite materials; Interim report on post-irradiation examinations of the first preliminary irradiation test 97M-13A

Baba, Shinichi; Suzuki, Yoshio*; Takahashi, Tsuneo*; Ishihara, Masahiro; Hayashi, Kimio; Saito, Tamotsu; Sozawa, Shizuo; Saito, Takashi; Sekino, Hajime

JAERI-Research 2001-028, 109 Pages, 2001/03

JAERI-Research-2001-028.pdf:4.55MB

no abstracts in English

JAEA Reports

Monte Carlo simulation on nuclear energy study, 2; Annual report of nuclear code evalution committee

Nuclear Code Evaluation Special Committee of Nuclear Code Research Committee

JAERI-Review 2000-027, 197 Pages, 2001/01

JAERI-Review-2000-027.pdf:15.16MB

no abstracts in English

Journal Articles

The Development of the advanced temperature control device for the irradiation capsule

Kitajima, Toshio; Abe, Shinichi; Takahashi, Kiyoshi; Onuma, Yuichi; Watanabe, Hiroyuki; Okada, Yuji; Oyake, Noriyuki*

UTNL-R-0404, p.6_1 - 6_9, 2001/00

no abstracts in English

Journal Articles

Effects of co-implanted oxygen or aluminum atoms on hydrogen migration and damage structure in multiple-beam irradiated Al$$_{2}$$O$$_{3}$$

Katano, Yoshio*; Aruga, Takeo; Yamamoto, Shunya; Nakazawa, Tetsuya; Yamaki, Daiju; Noda, Kenji

Journal of Nuclear Materials, 283-287(Part.2), p.942 - 946, 2000/12

 Percentile:100

no abstracts in English

154 (Records 1-20 displayed on this page)