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表面変性層制御と水素脱離温度特性との相関研究

Research into the correlation between surface degeneration layer control and hydrogen desorption temperature characteristic

戸出 真由美; Harries, J.; 寺岡 有殿; 吉越 章隆 

Tode, Mayumi; Harries, J.; Teraoka, Yuden; Yoshigoe, Akitaka

水素貯蔵合金表面の自然皮膜の熱安定性は、水素の吸収や脱離に影響を与える特性である。本研究では、TiFe表面皮膜の熱変性過程をX線放射光光電子分光法で調べた。実験はSPring-8の原子力機構専用軟X線ビームライン(BL23SU)に設置した表面反応分析装置(SUREAC2000)を用いて行った。TiFeを熱処理すると、酸化状態を示すピークが弱くなり、金属状態を示すピークが強くなる。表面に重水素イオンを注入すると、自然酸化膜の変質温度が200$$^{circ}$$C程度低くなる結果が得られた。

Thermal stability of native oxide layer on the hydrogen storage materials is related to the hydrogen absorption and desorption. In this study, thermal degradation process of native oxide layer on TiFe was observed by high resolution soft X-ray synchrotron radiation photoemission spectroscopy. All experiments have been conducted at the surface chemistry experimental station (SUREAC2000) at BL23SU, SPring-8. After thermal annealing, the peak that shows the oxidation weakens, and the peak that shows the metal strengthens. The thermal stability of a natural oxide layer was observed to stabilize by about 200 degrees by deuterium ion implanted.

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