Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Kenichi Hashizume Last modified date:2021.06.15

Associate Professor / Materals Science and engineering in severe conditions / Faculty of Engineering Sciences


Presentations
1. M.K. Hossain, K. Hashizume, Study on the hydrogen behavior in the barium zirconate proton conducting oxide materials, Materials of the Future: Smart Applications in Science and Engineering, 2021.03.
2. M.K. Hossain, K. Hashizume, Hydrogen isotopes behavior in oxide materials at high temperature atmosphere, "39th Annual Meeting of the Atomic Energy Society of Japan", Organized by- AESJ Kyushu Branch, 2020.12.
3. M.K. Hossain, K. Kawaguchi, K. Hashizume, Protonic conductivity and isotope dependency in rare-earth gadolinium oxide, 22nd Cross Straits Symposium on Energy and Environmental Science and Technology (CSS-EEST22), 2020.12.
4. M.K. Hossain, Yuji Hatano, K. Hashizume, Hydrogen isotopes behavior in oxide materials at high temperatures, 3rd Asia-Pacific Symposium on Tritium Science (APSOT-3), 2020.11.
5. M.K. Hossain, Kaname Kawaguchi, Yuji Hatano, K. Hashizume, Isotope effect in proton conductivity of gadolinium oxide, 3rd Asia-Pacific Symposium on Tritium Science (APSOT-3), 2020.11.
6. M.K. Hossain, Yuji Hatano, K. Hashizume, Study on hydrogen isotopes solubility and diffusivity in Y- and Co-doped barium-zirconates using tritium imaging plate technique, Materials Science & Technology 2020 (MS&T20), 2020.11.
7. M.K. Hossain, Yuji Hatano, K. Hashizume, Study on hydrogen isotopes distribution and dissolution in proton conducting zirconates, Nuclear Materials Conference 2020 (NuMat2020), 2020.10.
8. M.K. Hossain, Kaname Kawaguchi, K. Hashizume, Conductivity of gadolinium (III) oxide (Gd2O3) in hydrogen-containing atmospheres, 6th International Exchange and Innovation Conference on Engineering & Sciences (IEICES 2020), 2020.10.
9. M.K. Hossain, K. Hashizume, Dissolution and release behavior of hydrogen isotopes from barium-zirconates, 6th International Exchange and Innovation Conference on Engineering & Sciences (IEICES 2020), 2020.10.
10. M.K. Hossain, K. Hashizume, Visualization of hydrogen isotopes distribution in proton conducting oxides using tritium imaging plate technique, NIFS General Joint Research Workshop- “Tritium Issues in DEMO”, 2020.07.
11. M.K. Hossain, K. Hashizume, S. Jo, K. Kawaguchi, Y. Hatano, Tritium dissolution behavior in rare-earth oxides, Tritium 2019, 2019.04.
12. Yudai Urabe, Kenichi Hashizume, Teppei Otsuka, Kan Sakamoto, Tritium Permeation through Ce-ODS Steel, Tritium 2019, 2019.04.
13. Kenichi Hashizume, Hydrogen solubility and diffusivity in protonic conductors using tritium imaging plate technique, SOIFIT, 2018.02.
14. 橋爪 健一, 浦部雄大,白鶴拓也, Thermo-migration of hydrogen isotopes in iron and nickel, ICFRM-16, 2017.11.
15. 橋爪 健一, 大城佑輔, Application of Tritium Imaging Plate Technique to measuring hydrogen solubility and diffusivity in BaInO2.5, Tritium 2016, 2016.04.
16. 橋爪 健一, 大塚 哲平, 波多野雄治, Adsorption of tritium on oxide surfaces using imaging plate technique, Asia Pacific Symposium on Tritium science, 2015.11.
17. 橋爪 健一, Dissolution and permeation of hydrogen isotopes in a proton-conducting oxide, 2015 Japan-Korea Tritium Workshop, 2015.06.
18. 松田 浩輝, 橋爪 健一, HIDEO WATANABE, HYDROGEN DISSOLUTION IN AND RELEASE FROM OXIDE CERAMICS YSZ, 14th CSS-EEST, 2014.11.
19. 山下 健太, 橋爪 健一, Hydrogen solubility and diffusivity in Protonic Conductors using Tritium Imaging Plate Technique, Solid State Protonic Conductors-17, 2014.09.
20. 橋爪 健一, Degradation of Fuel and Materials in Water Reactors, 3rd Japan-Korea Joint Workshop on Materials Ageing in Nuclear Power Systems , 2014.08.
21. 橋爪 健一, 阿部信介, 波多野雄治, 松山政夫, 相良明男, Study on tritium adsorption on oxide surfaces using imaging plate technique
, 12th International Workshop on Hydrogen Isotopes in Fusion Reactor Materials (HWS2014) , 2014.06, Oxide specimens examined were single crystals bars (5×10×0.5 mm3) of alumina (Al2O3[0001]), spinel (MgAl2O4[111]), zirconia (13%Y2O3-ZrO2[100]) and synthetic quartz glass bars (5×10×1 mm3). After heating at given temperatures for 1h in a vacuum (<10-4 Pa), the specimens were exposed to 133Pa of a tritium-deuterium gas mixture (T/(T+D)~ 10-5 or 0.05) or ca. 2.5kPa of tritium water vapour (T/(T+D)~10-3) at a temperature ranging from room temperature to 1273 K for 1h, and then quenched down. After that, the surfaces of the specimens were exposed to tritium imaging plate (IP, BAS-TR2025). The tritium activity resulting from the IP measurement was converted to the hydrogen amount.
The characteristics of the amount of tritium uptaken at the specimen surfaces were classified into three temperature regions: (1) around room temperature, (2) 473K to 873K and (3) higher than 873K. In region (1), as it is well known, the amount of adsorbed tritium exposed to water vapour (1014H/cm2) was higher than that for tritium gas (1012H/cm2). Part of them were released in the air and decreased to one-tenth in a few days. In region (2), no clear differences in the amount of adsorbed tritium among the types of oxides and the exposure gas, and they increased with increasing temperature up to 1015H/cm2 and almost saturated at 873K. Tritium should be tightly bound to the oxide surfaces in this region, and there were no apparent decrease in the amount of tritium even several months later. In region (3), for the single crystal specimens (alumina, spinel and zirconia), the amount of adsorbed tritium decreased with increasing temperature. On the other hand, it on the quartz glass increased with temperature and exceeded the saturated value. This discrepancy might be attributed to tritium concentration in the near-surface bulk of the quartz glass: i.e. the concentration of dissolved tritium in it became high at elevated temperatures, compared with those of single crystals. As a result, the amount of tritium detected with IP might contain not only surface tritium but bulk one..
22. 松田 浩輝, 橋爪 健一, HIDEO WATANABE, Hydrogen Dissolution in and Release from Oxide Ceramic YSZ, 12th International Workshop on Hydrogen Isotopes in Fusion Reactor Materials (HWS2014) , 2014.06, In this study, the dependence of the hydrogen behavior was measured by D2 exposure at high temperature and TDS measurement. First, the dependence of hydrogen solubility on temperature was that the amount of dissolved deuterium in YSZ increased with the increasing temperature in the D2 exposure. This dependence of hydrogen thought to be similar to the literature values [1, 2]. Second, the dependence of hydrogen solubility on pressure was also that the amount of dissolved deuterium in YSZ increased with the increasing pressure in the D2 exposure. But a difference of the amount of dissolved deuterium on the time from D2 exposure to TDS measurement was observed, even though the samples were exposed in the same temperature, pressure and time. The amount decreased with the increasing time. Because the samples exposed by D2 atmosphere were kept in the air until they were measured by TDS, this result indicates that hydrogen once dissolved in YSZ may release from it under the air condition. This is a very interesting result about hydrogen behavior in oxide ceramic, so it is important to carefully research from now on..
23. 山口 諒真, 橋爪 健一, Hydrogen Dissolution in Oxide Ceramic Silica, 12th International Workshop on Hydrogen Isotopes in Fusion Reactor Materials (HWS2014) , 2014.06, In this study, we used two samples; silica which have 1000 ppm hydrogen, and water free silica. The dependence of the hydrogen behavior was measured by D2 and D2O exposure at high temperature and FT-IR measurement. In Silica, there was not change by D2 exposure, but there was change that O-H group peak fell and O-D group peak rose. By D2O exposure, there was not change. In Water Free Silica, there was not change by D2 and D2O exposure, either. In past study, O-H group peak was observed slightly in Water Free Silica by water vapor exposure with over 150 hours in high temperature. This is a very interesting result about hydrogen behavior in oxide ceramic, so it is important to carefully research from now on..
24. Makoto Higaki, Teppei Otsuka, KAZUTOSHI TOKUNAGA, Kenichi Hashizume, K. Ezato, S. Suzuki, M. Enoeda, M. Akiba, DETERMINATION OF HYDROGEN DIFFUSION COEFFICIENTS IN F82H BY HYDROGEN DEPTH PROFILING WITH A TRITIUM IMAGING PLATE TECHNIQUE, 10th International Conference on Tritium Science and Technology, 2013.10.
25. Teppei Otsuka, Kenichi Hashizume, BEHAVIOR OF TRITIUM PERMEATION INDUCED BY METALS CORROSION AROUND ROOM TEMPERATURE, 10th International Conference on Tritium Science and Technology, 2013.10.
26. K. Sakamoto, K. Une, M. Aomi, Kenichi Hashizume, Y. Matsukawa, K. Nagai, Oxidation Behavior of Alloying Elements in Oxide Layer of Zr-Based Alloys , NuMat2012 , 2012.09.
27. K. Sakamoto, K. Une, M. Aomi, Kenichi Hashizume, OXIDATION BEHAVIOR OF NIOBIUM IN OXIDE LAYER OF ZIRCONIUM-NIOBIUM ALLOYS , TopFuel 2012, 2012.09.
28. Kenichi Hashizume, K. Ogata, S. Akamaru, Y. Hatano, Solubility of hydrogen isotopes in zirconia ceramics, 4th Japan-China Workshop on Fusion-Related Tritium Science and Technology, 2012.05.