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Yokota, Kumiko*; Tagawa, Masahito*; Matsumoto, Koji*; Furuyama, Yuichi*; Kitamura, Akira*; Kanda, Kazuhiro*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden
Protection of Materials and Structures from the Space Environment; Astrophysics and Space Science Proceedings, Vol.32, p.531 - 539, 2012/08
Kubota, Naoyoshi; Fujiwara, Yoshio*; Okumura, Kazutaka*; Ochiai, Kentaro; Kitamura, Akira*; Furuyama, Yuichi*; Taniike, Akira*; Nishitani, Takeo
JAEA-Research 2006-019, 15 Pages, 2006/06
Surface analysis of lithium-6 (Li) was performed for both 95 % and 40 %
Li-enriched lithium titanate (Li
TiO
) samples as the candidate tritium breeding material using 2.6 MeV-proton Rutherford Backscattering Spectroscopy (RBS). The depth resolution of this method was enough to measure the
Li depth profile in terms of the evaluation of thermal neutron transportation. The atomic density of
Li could be measured within the error of 27 % for both samples although the accuracy of 5 % was not achieved for the evaluation of tritium breeding. It was confirmed that the sample atomic compositions agreed with Li
TiO
within errors of 30 % for Li/Ti and 15 % for O/Ti. The whole errors were caused by the data accuracy of scattering cross sections predominately. Providing more accurate cross section data can lead to the utilization of the RBS method for tritium breeding materials analysis.
Tagawa, Masahito*; Yokota, Kumiko*; Furuyama, Yuichi*; Kanda, Kazuhiro*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
Effects of vacuum ultraviolet and surface oxide layer on the hydrogen desorption from hydrogenated diamond-like carbon (HDLC) films were investigated. We have used commercially available HDLC as a specimen, and synchrotron radiation at BL-6 in NewSUBARU or D lamp as an external source of photon energy. SiO
and TiO
surface oxide films with a few nanometer thickness were formed by irradiation of hyperthermal atomic oxygen beams with a translational energy of approximately 5 eV onto metal-doped HDLCs in order to investigate the effect of oxide film on the hydrogen desorption. It was confirmed that the effect of SiO
and TiO
gave different influence on desorption temperature of hydrogen.
Tagawa, Masahito*; Yokota, Kumiko*; Furuyama, Yuichi*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
In order to make clear an effect of surface oxide layers for hydrogen desorption processes of hydrogen storage materials, ultra-thin metal oxide layers were formed on diamond-like-carbon (DLC) surfaces containing hydrogen and metals by irradiation of atomic oxygen beams. The thickness of SiO layer formed by the atomic oxygen beam irradiation was estimated to be about 4.5-6.5 nm on the basis of Si
/Si
photoemission peak area ratio. This value is larger than the diffusion depth of oxygen atoms in an Si crystal at a room temperature. Thermal desorption gas analyses revealed that a hydrogen desorption temperature did not change by the atomic oxygen beam irradiation. However, a hydrogen desorption temperature decreased in the atomic oxygen beam irradiation to a DLC containing Ti. The variation of hydrogen desorption temperature depends on a kind of metal oxide layer.
Yokota, Kumiko*; Tagawa, Masahito*; Furuyama, Yuichi*; Kanda, Kazuhiro*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden
no journal, ,
In this study, hydrogen desorption from highly-hydrogenated diamond-like-carbon (DLC) containing 54% hydrogen via vacuum ultraviolet light irradiation was investigated and compared to that of soft X-ray irradiation. An elastic recoil detection analysis (ERDA) spectrum showed the decrease of hydrogen up to 0.5 micrometer depth with increasing the dose of vacuum ultraviolet light. On the other hand, an ERDA spectrum for the soft X-ray irradiation revealed that the decrease of hydrogen from a whole depth, that is, hydrogen desorption reactions took place remarkably comparing to the vacuum ultraviolet light irradiation. In both cases, the thickness of DLC film did not change at all. These facts showed that a depth profile of hydrogen desorption via light excitation depended considerably on wavelength.
Tagawa, Masahito*; Yokota, Kumiko*; Kishida, Kazuhiro*; Furuyama, Yuichi*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden; Minton, T. K.*
no journal, ,
no abstracts in English
Takahashi, Genki*; Furuyama, Yuichi*; Okamoto, Masanori*; Kawatsu, Sho*; Taniike, Akira*; Kitamura, Akira*; Kubota, Naoyoshi; Ochiai, Kentaro; Nishitani, Takeo
no journal, ,
no abstracts in English
Yokota, Kumiko*; Yoshigoe, Akitaka; Teraoka, Yuden; Kanda, Kazuhiro*; Furuyama, Yuichi*; Matsumoto, Koji*; Tagawa, Masahito*
no journal, ,
Takahashi, Genki*; Kawatsu, Sho*; Unehara, Hiroshi*; Furuyama, Yuichi*; Taniike, Akira*; Kitamura, Akira*; Ochiai, Kentaro; Kubota, Naoyoshi; Nishitani, Takeo
no journal, ,
no abstracts in English