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Irradiation effects on hydriding characteristics of metal hydride

水素吸蔵合金の水素化特性に関する照射効果

大貫 駿*; 阿部 浩之; 松村 義人*; 内田 裕久*

Onuki, Shun*; Abe, Hiroshi; Matsumura, Yoshihito*; Uchida, Hirohisa*

水素吸蔵合金はNi-MH電池の陰極材料等、広く利用されているが、さらなる性能向上のために、より高い水素吸収速度を持つ合金開発が要求されている。そこでわれわれはイオンビームにより水素吸蔵合金の水素吸収速度を改善することを試みてきた。本研究では、電子線照射及び、イオンビーム照射を行ったLa-Ni系水素吸蔵合金の水素吸収速度変化を測定した。試料としては、LaNi$$_{5-x}$$Al$$_{x}$$合金を使用し、JAEAの2MVコッククロフトウォルトン型電子線加速器及びTIARA(高崎イオン照射研究施設)の400kVイオン注入装置を利用し電子及びイオンを照射した。La-Ni系合金の照射と未照射の水素吸収速度をジーベルツ装置及び電気化学的実験装置を用いて測定した。その結果、電子及びイオン照射合金は未照射材料に比べ、水素吸収速度が数倍速くなり、水素吸蔵特性が改善することがわかった。

Hydrogen storage alloys are applied to the negative electrodes of the Ni-MH batteries. In such metal alloys high hydrogen absorption rate is required for the practical use. The electron/ion beam modifications are of effective methods to improve the hydrogen absorption rate in metal. In the present study, we have carried out the irradiation of electron beam and charged ion to La-Ni based hydrogen storage alloy. We measured the hydrogen absorption rates in irradiated/un-irradiated La-Ni based alloys. The samples used in this study were LaNi$$_{5-x}$$Al$$_{x}$$ alloys. An electron beam or several ion irradiations used the 2 MV Cockcroft-Walton electron accelerator or the TIARA(Takasaki Ion Accelerators for Advanced Radiation Application) 400 kV ion implanter in JAEA. The hydrogen absorption rate measurements were also performed for the irradiated and un-irradiated La-Ni based alloy samples using the Severs equipment. The chemical compositions in the surface of the irradiated La-Ni bossed alloys were analyzed by scanning electron microscopy equipped with energy dispersive spectroscopy. The crystal structure and phase of the bulk into the irradiated La-Ni based alloys were determined by X-ray diffraction.

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