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Journal Articles

Hydrogen removal from hydrogenated diamond-like carbon films by exposure to photon and energetic atomic oxygen beams

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

JAEA Reports

Quantitative analysis on the surface of Lithium-6 enriched lithium titanate using proton RBS (Cooperative research)

Kubota, Naoyoshi; Fujiwara, Yoshio*; Okumura, Kazutaka*; Ochiai, Kentaro; Kitamura, Akira*; Furuyama, Yuichi*; Taniike, Akira*; Nishitani, Takeo

JAEA-Research 2006-019, 15 Pages, 2006/06

JAEA-Research-2006-019.pdf:0.75MB

Surface analysis of lithium-6 ($$^{6}$$Li) was performed for both 95 % and 40 % $$^{6}$$Li-enriched lithium titanate (Li$$_{2}$$TiO$$_{3}$$) 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 $$^{6}$$Li depth profile in terms of the evaluation of thermal neutron transportation. The atomic density of $$^{6}$$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$$_{2}$$TiO$$_{3}$$ 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.

Oral presentation

Effect of vacuum ultraviolet exposure and surface oxide layer on the hydrogen desorption from hydrogenated diamond-like carbon films

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$$_{2}$$ lamp as an external source of photon energy. SiO$$_{2}$$ and TiO$$_{2}$$ 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$$_{2}$$ and TiO$$_{2}$$ gave different influence on desorption temperature of hydrogen.

Oral presentation

Effect of surface metal oxide on the desorption of hydrogenation from hydrogenated diamond-like carbon films

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$$_{2}$$ layer formed by the atomic oxygen beam irradiation was estimated to be about 4.5-6.5 nm on the basis of Si$$^{0}$$/Si$$^{4+}$$ 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.

Oral presentation

Effect of VUV exposures to the hydrogenated diamond-like carbon films

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.

Oral presentation

Desorption of volatile reaction products from hydrogenated DLC films under atomic oxygen beam exposure

Tagawa, Masahito*; Yokota, Kumiko*; Kishida, Kazuhiro*; Furuyama, Yuichi*; Tode, Mayumi; Yoshigoe, Akitaka; Teraoka, Yuden; Minton, T. K.*

no journal, , 

no abstracts in English

Oral presentation

Measurement of Li isotope distribution in Li$$_2$$TiO$$_3$$ for blanket materials of fusion reactor using nuclear reaction analysis

Takahashi, Genki*; Furuyama, Yuichi*; Okamoto, Masanori*; Kawatsu, Sho*; Taniike, Akira*; Kitamura, Akira*; Kubota, Naoyoshi; Ochiai, Kentaro; Nishitani, Takeo

no journal, , 

no abstracts in English

Oral presentation

Protection of materials from O-atom collision in low earth orbit using thin oxide film growth in space

Yokota, Kumiko*; Yoshigoe, Akitaka; Teraoka, Yuden; Kanda, Kazuhiro*; Furuyama, Yuichi*; Matsumoto, Koji*; Tagawa, Masahito*

no journal, , 

Oral presentation

Composition analysis of Li compounds for blanket candidate materials with accelerator analysis

Takahashi, Genki*; Kawatsu, Sho*; Unehara, Hiroshi*; Furuyama, Yuichi*; Taniike, Akira*; Kitamura, Akira*; Ochiai, Kentaro; Kubota, Naoyoshi; Nishitani, Takeo

no journal, , 

no abstracts in English

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