Anomalous Difference between Replacements of D–H and H–D in Oxide Ceramics by Exposure to Air Containing H<sub>2</sub>O and D<sub>2</sub>O Vapors

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  • Iizuka Emi
    Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
  • Horikawa Tomoaki
    Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
  • Tsuchiya Bun
    The Oarai Branch, Institute for Materials Research, Tohoku University, Oarai-machi, Ibaraki 311-1313, Japan
  • Soda Kazuo
    Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
  • Morita Kenji
    Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
  • Iwahara Hiroyasu
    Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya 464-8603, Japan

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タイトル別名
  • Anomalous Difference between Replacements of D-H and H-D in Oxide Ceramics by Exposure to Air Containing H2O and D2O Vapors.

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We have investigated the exchange of deuterium (or protium) implanted into an oxide ceramic, SrCe0.95Yb0.05O3-δ, for protium (or deuterium) due to exposure to H2O (or D2O) vapor at room temperature by means of the elastic recoil detection (ERD) technique. It is found that D is completely exchanged for H by exposure to H2O vapor, while H is hardly exchanged for D by exposure to D2O vapor, namely there exists a great isotope difference between the exchange of D for H and that of H for D. This result suggests a new model of replacement reactions; dissociative absorption of H at the surface, diffusion of H and release of D due to H-D mix-molecular bulk recombination and the subsequent trapping of H in the vacant trapping sites. In order to clarify the reaction leading to the great isotope difference, the experiments on the retention of H and D by simultaneous H+, D+ implantation and the release of 5 keV D2+ implants by 0.5 keV H2+ irradiation and that of 5 keV H2+ implants by 0.5 keV D2+ irradiation have been done. The retention experiment shows that the D/H ratio of the saturation implantation concentration is 1.3. Competition among H-H, H-D and D-D bulk recombination prefers to enrich D more than H, which is opposite to the isotope difference observed. The release experiment shows that the slow and continuous decay of 5 keV D2+ implants is induced by long-term 0.5 keV H2+ irradiation, while that of 5 keV H2+ implants is hardly induced by long-term 0.5 keV D2+ irradiation. The latter result suggests that the isotope difference in the hydrogen diffusion is one of the origins of the major isotope difference.

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