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JAEA Reports

Performance confirmation operation of water environment control facility

Magome, Hirokatsu; Okada, Yuji; Tomita, Kenji; Iida, Kazuhiro; Ando, Hitoshi; Yonekawa, Akihisa; Ueda, Haruyasu; Hanawa, Hiroshi; Kanno, Masaru; Sakuta, Yoshiyuki

JAEA-Technology 2015-025, 100 Pages, 2015/09

JAEA-Technology-2015-025.pdf:78.32MB

In Japan Atomic Energy Agency, in order to solve the problem in the long-term operation of a light water reactor, preparation which does the irradiation experiment of light-water reactor fuel and material was advanced. JMTR stopped after the 165th operation cycle in August 2006, and is advancing renewal of the irradiation facility towards re-operation. The material irradiation test facility was installed from 2008 fiscal year to 2012 fiscal year in JMTR. The material irradiation test facility is used for IASCC study, and that consists of mainly three equipments. This report is described performance operating test of the water environmental control facilities for IASCC study carried out 2013 fiscal year.

JAEA Reports

Installation of the water environment irradiation facility for the IASCC research under the BWR/PWR irradiation environment, 2

Magome, Hirokatsu; Okada, Yuji; Hanawa, Hiroshi; Sakuta, Yoshiyuki; Kanno, Masaru; Iida, Kazuhiro; Ando, Hitoshi; Yonekawa, Akihisa; Ueda, Haruyasu; Shibata, Mitsunobu

JAEA-Technology 2014-023, 267 Pages, 2014/07

JAEA-Technology-2014-023-01.pdf:103.68MB
JAEA-Technology-2014-023-02.pdf:71.92MB

In Japan Atomic Energy Agency, in order to solve the problem in the long-term operation of a light water reactor, preparation which does the irradiation experiment of light-water reactor fuel and material was advanced. JMTR stopped after the 165th operation cycle in August 2006, and is advancing renewal of the irradiation facility towards re-operation. The material irradiation test facility was installed from 2008 fiscal year to 2012 fiscal year in JMTR. This report summarizes manufacture and installation of the material irradiation test facility for IASCC research carried out from 2012 to 2014 in the follow-up report reported before (JAEA-Technology 2013-019).

JAEA Reports

Installation of the water environment irradiation facility for the IASCC research under the BWR irradiation environment, 1

Okada, Yuji; Magome, Hirokatsu; Hanawa, Hiroshi; Omi, Masao; Kanno, Masaru; Iida, Kazuhiro; Ando, Hitoshi; Shibata, Mitsunobu; Yonekawa, Akihisa; Ueda, Haruyasu

JAEA-Technology 2013-019, 236 Pages, 2013/10

JAEA-Technology-2013-019.pdf:45.07MB

In Japan Atomic Energy Agency, in order to solve the problem in the long-term operation of a light water reactor, preparation which does the irradiation experiment of light-water reactor fuel and material is advanced. JMTR stopped after the 165th operation cycle in August 2006, and is advancing renewal of the irradiation facility towards re-operation. This material irradiation test facility and power ramping test facility for doing the neutron irradiation test of the fuel and material for light water reactors is scheduled to be manufactured and installed between the 2008 fiscal year and the 2012 fiscal year. This report summarizes manufacture and installation of the material irradiation test facility for IASCC research carried out from the 2008 fiscal year to the 2010 fiscal year.

Journal Articles

Axial orientation of molecular-beam-epitaxy-grown Fe$$_{3}$$Si/Ge hybrid structures and its degradation

Maeda, Yoshihito; Jonishi, Takafumi*; Narumi, Kazumasa; Ando, Yuichiro*; Ueda, Koji*; Kumano, Mamoru*; Sado, Taizo*; Miyao, Masanobu*

Applied Physics Letters, 91(17), p.171910_1 - 171910_3, 2007/10

 Times Cited Count:31 Percentile:72.74(Physics, Applied)

The axial orientation of molecular-beam-epitaxy (MBE)-grown Fe$$_{3}$$Si(111)/Ge(111) hybrid structures was investigated by Rutherford backscattering spectroscopy. We confirmed that during MBE above 300$$^{circ}$$C, the interdiffusion of Fe and Ge atoms results in a composition change and the epitaxial growth of FeGe in Fe$$_{3}$$Si. Low-temperature ($$<$$200 $$^{circ}$$C) MBE can realize fully ordered DO$$_{3}$$-Fe$$_{3}$$Si with highly axial orientation [minimum yield ($$chi$$$$_{min}$$)=2.2%]. Postannealing above 400 $$^{circ}$$C results in a composition change and the degradation of axial orientation in the off-stoichiometric Fe$$_{3}$$Si. The significance of stoichiometry with regard to thermal stability and the interfacial quality of Fe$$_{3}$$Si(111)/Ge(111) hybrid structures was also discussed.

Journal Articles

Low temperature hetero-epitaxy of ferromagnetic silicide on Ge substrates for spin-transistor application

Ando, Yuichiro*; Ueda, Koji*; Kumano, Mamoru*; Sado, Taizo*; Narumi, Kazumasa; Maeda, Yoshihito; Miyao, Masanobu*

Shingaku Giho, 107(111), p.221 - 224, 2007/06

Ferromagnetic silicide Fe$$_{3}$$Si (Currie temperature: 840 K) has three phases (A2, B2, and DO3), where the DO3-type is an ordered phase and calculated to be spin-polarized at the Fermi level. In addition, the lattice constant (0.565 nm) of Fe$$_{3}$$Si is almost completely equal to that (0.565 nm) of Ge. Therefore, atomically controlled epitaxial growth of Fe$$_{3}$$Si is expected on Ge. This will be a powerful tool to realize Ge channel spin transistors with ultrahigh speed operation and ultralow power consumption. This paper reviews our recent progress in novel epitaxial growth of Fe$$_{3}$$Si on Ge for spintronics application.

Journal Articles

Low-temperature epitaxial growth of [Fe$$_{3}$$Si/SiGe]$$_{n}$$ (n = 1-2) multi-layered structures for spintronics application

Sado, Taizo*; Ueda, Koji*; Ando, Yuichiro*; Kumano, Mamoru*; Narumi, Kazumasa; Maeda, Yoshihito; Miyao, Masanobu*

ECS Transactions, 11(6), p.473 - 479, 2007/00

Our recent progresses in epitaxial growth of Fe$$_{3}$$Si on Ge substrates are reviewed. Single crystalline Fe$$_{3}$$Si layers with atomically flat interfaces were achieved on Ge(111) substrates by optimizing growth conditions at low temperatures (60$$sim$$200 $$^{circ}$$C). Thermal stability of it was guaranteed up to 400 $$^{circ}$$C. In addition, epitaxial growth of mixed layers composed of Fe$$_{3}$$Si, FeGe, and FeSi on Ge substrates at 400 $$^{circ}$$C is reported. Finally, epitaxial growth of Fe$$_{3}$$Si/Ge/Fe$$_{3}$$Si/Ge structures is discussed. These results will be a powerful tool to open up SiGe related spintronics.

Journal Articles

Effect of Fe/Si ratio on epitaxial growth of Fe$$_{3}$$Si on Ge substrate

Kumano, Mamoru*; Ando, Yuichiro*; Ueda, Koji*; Sado, Taizo*; Narumi, Kazumasa; Maeda, Yoshihito; Miyao, Masanobu*

ECS Transactions, 11(6), p.481 - 485, 2007/00

The effects of the Fe/Si ratios on molecular beam epitaxy (MBE) of Fe$$_{3}$$Si on Ge substrate have been investigated in a wide range of growth temperatures (60$$sim$$300 $$^{circ}$$C). From XRD measurements, it was found that Fe$$_{3}$$Si layers were epitaxially grown on Ge(111) substrates at 60$$sim$$200 $$^{circ}$$C under the stoichiometric (Fe:Si = 3:1) and non-stoichiometric (Fe:Si = 4:1) conditions. From RBS measurement, it was found that atomic mixing of Fe and Ge at Fe$$_{3}$$Si/Ge interfaces began at a growth temperature of 300 $$^{circ}$$C. In the case of MBE under the stoichiometric condition, the crystallinity of Fe$$_{3}$$Si is significantly improved compared to the non-stoichiometric condition. As a result, very low $$chi$$$$_{min}$$ was obtained in a wide temperature (60$$sim$$200 $$^{circ}$$C) under the stoichiometric condition. From the transmission electron microscopy measurements, it was shown that high-quality DO3-type Fe$$_{3}$$Si/Ge structures with atomically flat interfaces were realized at a low temperature ($$sim$$200 $$^{circ}$$C) under the stoichiometric condition.

JAEA Reports

Development of advanced neutron radiography for inspection on irradiated fuels and materials, 3; Examination of neutron imaging plate and computed tomography methods on unirradiated fuel rod

Yasuda, Ryo; Matsubayashi, Masahito; Nakata, Masahito; Harada, Katsuya; Amano, Hidetoshi; Ando, Hitoshi*; Sasajima, Fumio; Nishi, Masahiro; Horiguchi, Yoji

JAERI-Tech 2002-001, 23 Pages, 2002/02

JAERI-Tech-2002-001.pdf:3.79MB

Advanced neutron radiography techniques such as neutron imaging plate (NIP) and Computed Tomography (CT) methods have been investigated the practicality for Post Irradiation Examination (PIE). In this work, an unirradiated fuel rod was examined by NIP and CT methods in order to collect the fundamental data for applying these techniques to PIE.The fuel rod is composed of seven-enriched UO2 pellet and two-natural UO2 pellet that are loaded into a Zircaloy tube. There are somewhat difference in the size and shape among those UO2 pellets. A transmitted and cross-sectional images were obtained by NIP and CT methods, respectively.In the NIP image, the difference in the size, shape, and enrichment among the UO2 pellets is obviously recognized. In the case of CT method, the images clearly show the detailed shape of the cross section in the pellets, in addition, the difference in the enrichment between the natural and enriched pellets is recognized.

JAEA Reports

Development of advanced neutron radiography for inspection on irradiated fuels and materials, 2; Observation of hydride and oxide film on zircaloy cladding using by neutron radiography

Yasuda, Ryo; Nakata, Masahito; Matsubayashi, Masahito; Harada, Katsuya; Ando, Hitoshi*

JAERI-Tech 2000-082, 38 Pages, 2001/02

JAERI-Tech-2000-082.pdf:7.79MB

no abstracts in English

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