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Journal Articles

Electronic structure of BaTiO$$_{3}$$ using resonant X-ray emission spectroscopy at the Ba-L$$_{3}$$ and Ti K absorption edges

Yoshii, Kenji; Yoneda, Yasuhiro; Jarrige, I.*; Fukuda, Tatsuo; Nishihata, Yasuo; Suzuki, Chikashi; Ito, Yoshiaki*; Terashima, Takahito*; Yoshikado, Shinzo*; Fukushima, Sei*

Journal of Physics and Chemistry of Solids, 75(3), p.339 - 343, 2014/03

 Times Cited Count:5 Percentile:68.68(Chemistry, Multidisciplinary)

We have studied the electronic properties of ferroelectric BaTiO$$_{3}$$ using two complementary bulk-sensitive spectroscopic probes, resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS). Contrary to a previous study, we found no temperature change of a PFY-XAS spectrum at the Ba L$$_{3}$$ edge between room temperature and 150$$^{circ}$$C. This result is not supportive of the possible presence of the displacement around Ba$$^{2+}$$ at the Curie temperature. RXES spectra were measured at the Ti K edge for BaTiO$$_{3}$$, along with SrTiO$$_{3}$$ and La-doped metallic SrTiO$$_{3}$$. The photon energy of the emission peak is found to be nearly constant throughout the absorption edge for all three compounds. We deduce the Ti 3d states to have a delocalized character, in contrast with the Ba 5d states, a property which is consistent with the proposed scenario of the formation of electric dipoles in BaTiO$$_{3}$$.

Journal Articles

Probing the Ba 5d states in BaTiO$$_{3}$$ and BaSO$$_{4}$$; A Resonant X-ray emission study at the Ba-L$$_{3}$$ edge

Yoshii, Kenji; Jarrige, I.; Suzuki, Chikashi; Matsumura, Daiju; Nishihata, Yasuo; Yoneda, Yasuhiro; Fukuda, Tatsuo; Tamura, Kazuhisa; Ito, Yoshiaki*; Mukoyama, Takeshi*; et al.

Journal of Physics and Chemistry of Solids, 73(9), p.1106 - 1110, 2012/09

 Times Cited Count:9 Percentile:55.31(Chemistry, Multidisciplinary)

We have directly probed the Ba 5d states in the ferroelectric barium titanate BaTiO$$_{3}$$ using resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS) at the Ba-L$$_{3}$$ edge. The results are compared with those of the non-ferroelectric BaSO$$_{4}$$. While the RXES spectra point to a localized character for the Ba 5d states in both compounds, the main peak of the PFY-XAS spectrum, corresponding to the dipolar transitions from 2p to 5d, is found to be significantly broader for BaTiO$$_{3}$$ than for BaSO$$_{4}$$. On the basis of band structure calculations, this broadening is ascribed to strong hybridization between the unoccupied Ba 5d and O 2p states in the ferroelectric. This suggests that the hybridization between the conduction states of the Ba$$^{2+}$$ and O$$^{2-}$$ ions, and not only Ti$$^{4+}$$ and O$$^{2-}$$, plays a central role in determining the electronic structure of BaTiO$$_{4}$$.

Journal Articles

Applying systematic geosynthesis methodology to surface-based investigation in "Horonobe URL Project", Japan

Hatanaka, Koichiro; Shigeta, Naotaka; Fukushima, Tatsuo

Proceedings of 2008 International High-Level Radioactive Waste Management Conference (IHLRWM 2008) (CD-ROM), p.101 - 108, 2008/09

The surface-based investigation (Phase I) in the Horonobe URL project has been conducted from March, 2001 until the end of the year 2005 as shown in Figure 1. Throughout the Phase I investigation, the concepts of geosynthesis and iterative assessment of the stepwise investigations were introduced towards characterization of the geological environment in the area including Horonobe URL site and the applicability was confirmed. The achievement of the Phase I investigation was summarized in the year 2006 and the relevant progress reports were published in March, 2007. In this paper, the concepts based on the geosynthesis methodology and its iterative application throughout stepwise investigations applied in the Horonobe URL project are discussed and summarized.

Journal Articles

Development of engineering technology for sedimentary rock in "Horonobe URL Project", Japan

Hatanaka, Koichiro; Morioka, Hiroshi*; Fukushima, Tatsuo

Proceedings of 2008 International High-Level Radioactive Waste Management Conference (IHLRWM 2008) (CD-ROM), p.250 - 257, 2008/09

In this paper, the procedure for planning design/construction of the underground facilities developed in Phase I of Horonobe URL project, and current status of the actual construction in Phase II based on the design and relevant engineering technology developed in Phase I are briefly described.

JAEA Reports

Horonobe Underground Research Laboratory project synthesis of phase I investigations 2001-2005 volume "Geoscientific Research"

Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Kunimaru, Takanori; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; Hama, Katsuhiro; Matsui, Hiroya; et al.

JAEA-Research 2007-044, 434 Pages, 2007/03

JAEA-Research-2007-044.pdf:54.58MB
JAEA-Research-2007-044(errata).pdf:0.08MB

The Horonobe URL Project started in 2000. Research and development activities are planned over three phases, that will span a total duration of about 20 years: the 1st surface-based investigarion phase (6 years), the 2nd URL construction phase (8 years) and rhe 3rd operation phase (12 years). Geological, geophysical, geo-mechanical, hydrogeological, and hydro-geochemical investigations have been carried out during the surface-based investigation.

Journal Articles

A Case study of analysis of faults in Neogene siliceous rocks

Ishii, Eiichi; Fukushima, Tatsuo

Oyo Chishitsu, 47(5), p.280 - 291, 2006/12

Because some fractures might be water conducting features in rocks, it is necessary to consider sufficiently the fractures, for development of a geological model. In this study, we have tried to understand geological characteristics and formative processes of faults in Neogene siliceous rocks, based on results of outcrop observation, boring-core observation, and borehole-wall observation, in order to develop an investigation technique for water conducting features. In addition, we have tried to estimate permeability of faults and to develop a geological conceptual model including water conducting features. The results of this study suggest the follow: Concerning faults without filling minerals and hydro-thermal alteration in Neogene siliceous rocks including fold structures, (1) in order to classify the faults, an attention of relation between fault direction and fold axis/bedding direction, of displacement sense, and of displacement is effective. (2) in order to understand the formative process of the faults, an observation of crosscutting relations of faults, an analysis of relationship between faulting and folding, and an inference of stress conditions of faulting by fault striation analysis are effective. (3) in order to estimate hydro-geological property, an observation of redox front along faults near the surface, and an analysis of fault density, of formative process of faults, and of relation between fault direction and stress axis are effective.

Journal Articles

The Outline and present state of the Horonobe Underground Research Laboratory Project

Seya, Masami; Hatanaka, Koichiro; Fukushima, Tatsuo

Sato Kogyo Gijutsu Kenkyushoho, (31), p.49 - 56, 2006/11

Although the atomic energy is utilized as effective energy source, treatment and disposal of high-level radioactive waste are important issues to be solved. In Japan, the high-level radioactive waste is planned to be disposed off in deep underground and R&D programs for the treatment and the disposal of the high-level radioactive waste are underway by Japan Atomic Energy Agency(JAEA) and other research institutes. The Horonobe Underground Research Laboratory Project is one of the research projects of JAEA to establish the scientific and technical basis in sedimentary rocks at Horonobe-cho, Hokkaido. In this report we introduce the outline and current status of the Horonobe Underground Reasearch Laboratory Project.

Journal Articles

The Construction plan of the Horonobe Underground Research Laboratory

Seya, Masami; Morioka, Hiroshi; Fukushima, Tatsuo

Sato Kogyo Gijutsu Kenkyushoho, (31), p.57 - 62, 2006/11

Japan Atomic Energy Agency is constructing a deep underground research laboratory at Horonobe-cho, Hokkaido. In this report, the outline of the construction plan of the Horonobe Underground Research Laboratory, treatment of muck and groundwater produced by the construction as environmental point of view, and observational method and disaster control as security are introduced.

Journal Articles

Preliminary results of surface-based investigation at the Horonobe url site,Japan

Yamasaki, Shinichi; Fukushima, Tatsuo; Aoki, Kazuhiro

Proceedings of 2nd International Meeting on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement, p.59 - 60, 2005/03

Two off-site Underground Research Laboratory (URL) projects, which are mentioned in the

JAEA Reports

International Workshop on Horonobe Underground Research Laboratory Prooject / Record (Research Document)

Yamasaki, Shinichi; Matsui, Hiroya; Hama, Katsuhiro; Morioka, Hiroshi; Hatanaka, Koichiro; Fukushima, Tatsuo; SEYA, Masami

JNC-TN5400 2004-005, 181 Pages, 2004/12

JNC-TN5400-2004-005.pdf:49.9MB
JNC-TN5400-2004-005(errata).pdf:0.08MB

This report includes the records for the international workshop on Hornobe Underground Research Laboratory Project. Abstracts, Slides for Presentation, and so on.

JAEA Reports

International workshop on horonobe underground research laboratory project abstracts

Yamasaki, Shinichi; Matsui, Hiroya; Hama, Katsuhiro; Morioka, Hiroshi; Hatanaka, Koichiro; Fukushima, Tatsuo

JNC-TN5400 2004-004, 0 Pages, 2004/10

JNC-TN5400-2004-004.pdf:4.66MB

Japan Nuclear Cycle Development Institute (JNC) is pursuing two underground research laboratory (URL) projects to conduct a systematic research on geological disposal of high level radioactive wastes. The Tono Geoscience Center (TGC) has been carrying out research and development in crystalline rocks at Mizunami in central Japan and the Horonobe Underground Research Center in sedimentary rocks at Horonobe in northern Japan. Both projects are nearing termination of the first phase of surface-based investigation and is about to move on to the next phase of actually constructing the facilities underground. To mark this transition of phases, an international conference is organized to promote domestic and international recognition for the significance of constructing the URLs by disseminating research findings to a broad range of researchers and specialists from within and outside Japan as well as to the local community.

Journal Articles

Developing a remote monitoring system using ACROSS in the Horonobe Underground Research Laboratory

Tsukui, Rota; Niizato, Tadafumi; ; Fukushima, Tatsuo

Proceedings of 1st International Workshop on Active Monitoring in the Solid Earth Geophysics (IWAM 2004), 0 Pages, 2004/07

Japan Nuclear Cycle Development Institute (JNC) is developing a remote monitoring system using seismic and electromagnetic ACROSS (Accurately Controlled Routinely Operated Signal System) in the Horonobe Underground Research Laboratory (URL). Horonobe URL is devoting to the technology development for the safe geological disposal of high level radioactive wastes over 20 years. The project has been operating since March 2001 in Horonobe-cho, northern Hokkaido, Japan. The target of a remote monitoring system is to monitor the change of geological environment before, during and after the construction of the URL underground facility. Receiver system of seismic ACROSS and source and receiver system of electromagnetic ACROSS will be installed in 2004 fiscal year, while source of seismic ACROSS will be transported from Tono Geoscience Center in 2005.

Oral presentation

Horonobe Underground Research Laboratory project, 2; History of URL site selection

Kunimaru, Takanori; Fukushima, Tatsuo; Takeda, Seietsu

no journal, , 

no abstracts in English

Oral presentation

Outline for the Horonobe Underground Research Laboratory project synthesis of phase I investigations 2001 - 2005

Kunimaru, Takanori; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; Hama, Katsuhiro; Matsui, Hiroya; et al.

no journal, , 

The Horonobe Underground Research Laboratory (URL) Project is being pursued by the Japan Atomic Energy Agency (JAEA) to enhance the reliability of relevant disposal technologies through investigations of the deep geological environment within the host sedimentary formations at Horonobe, northern Hokkaido. The project consists of two major research areas, "Geoscientific Research" and "R&D on Geological Disposal", and proceeds in three overlapping phases, "Phase I: Surface-based investigation", "Phase II: Construction" and "Phase III: Operation", over a period of 20 years. The present report summarises the results of the Phase I geoscientific research carried out from March 2001 to March 2005. Integration of work from different disciplines into a "geosynthesis" ensures that the Phase I goals have been successfully achieved and identifies key issues that need to be addressed in the Phase II/III investigations.

Oral presentation

Horonobe Underground Research Laboratory Project synthesis of phase 1 investigations 2001-2005; Development of engineering technologies for the deep geological environment

Sanada, Hiroyuki; Hanakawa, Toshiyuki; Ota, Kunio; Abe, Hironobu; Yamaguchi, Takehiro; Kunimaru, Takanori; Ishii, Eiichi; Kurikami, Hiroshi; Tomura, Goji; Shibano, Kazunori; et al.

no journal, , 

no abstracts in English

Oral presentation

Electronic structure observation of BaTiO$$_{3}$$ using resonant X-ray emission at Ba L$$_{3}$$ and Ti K edges

Yoshii, Kenji; Yoneda, Yasuhiro; Jarrige, I.*; Fukuda, Tatsuo; Nishihata, Yasuo; Suzuki, Chikashi; Ito, Yoshiaki*; Yoshikado, Shinzo*; Fukushima, Sei*

no journal, , 

We have studied the electronic properties of the ferroelectric barium titanate BaTiO$$_{3}$$ using resonant X-ray emission spectroscopy (RXES) and X-ray absorption spectroscopy in the partial fluorescence mode (PFY-XAS) at the Ba L$$_{3}$$ and Ti K absorption edges. Contrary to a previous study, we found no fine structure in the pre-edge area of the PFY-XAS spectrum at the Ba L3 edge, and no temperature-induced spectral change was observed across the Curie temperature (130$$^{circ}$$C). This result is not supportive of the possible presence of the displacement around Ba$$^{2+}$$ at the Curie temperature. RXES spectra were measured at the Ti K edge. The photon energy of the emission peak is found to be nearly constant throughout the absorption edge for all three compounds. We deduce the Ti 3d states to have a delocalized character, in contrast with the Ba 5d states, a property which is consistent with the proposed scenario of the formation of electric dipoles in BaTiO$$_{3}$$.

Oral presentation

Atmosphere measurement by compact Raman Lidar under nuclear environment

Chigira, Tomoyuki*; Shiina, Tatsuo*; Saito, Hayato*; Manago, Naohiro*; Kuze, Hiroaki*; Hanyu, Toshinori; Kanayama, Fumihiko; Fukushima, Mineo

no journal, , 

The compact Raman Lidar is developed for the atmosphere measurement under nuclear environment, in which radiation ionize the water vapor and generate the water-cluster. In this study, the Raman lidar throws the NUV-beam of 349 nm and detects the backscattering echoes of water-Raman (396 nm) and the water-vapor-Raman (400 nm). Am-241 of 9 MBq was used for the radiation source. The results showed that the water-Raman increased and the water-vapor-Raman decreased under the nuclear environment. Its ratio becomes 3 times. It is well coincide with the estimation. The radius of water cluster was estimated 200 nm by the experiment.

Oral presentation

Compact Raman lidar measurement of liquid and vapor phase water under the influence of ionizing radiation

Shiina, Tatsuo*; Chigira, Tomoyuki*; Saito, Hayato*; Manago, Naohiro*; Kuze, Hiroaki*; Hanyu, Toshinori; Kanayama, Fumihiko; Fukushima, Mineo

no journal, , 

Oral presentation

Compact Raman Lidar measurement of liquid and vapor phase water under the influence of ionizing radiation

Shiina, Tatsuo*; Saito, Hayato*; Manago, Naohiro*; Kuze, Hiroaki*; Hanyu, Toshinori; Kanayama, Fumihiko; Fukushima, Mineo

no journal, , 

no abstracts in English

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