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Report No.
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A System for time-resolved XRD measurements on hydrogen absorption processes

Machida, Akihiko; Higuchi, Kensuke*; Katayama, Yoshinori; Sakaki, Koji*; Kim, H.*; Nakamura, Yumiko*

To improve performance of hydrogen storage materials, it is essential to understand detailed mechanism of hydrogenation and dehydrogenation reactions. In-situ powder diffraction measurements provide direct information about structural changes accompanying the reactions. We therefore installed a time-resolved X-ray diffraction (XRD) system at a beamline BL22XU at the SPrign-8, a synchrotron radiation facility in Japan. The system equipped area detectors. A sample cell was connected to a hydrogen supply system. The pressure of hydrogen gas was limited to 1 MPa. To demonstrate the performance of the system, we have performed time-resolved XRD experiments for LaNi$$_{4.5}$$Al$$_{0.5}$$. LaNi$$_{5}$$ exhibits the significant broadening of the diffraction peaks by hydrogen absorption; however, LaNi$$_{4.5}$$Al$$_{0.5}$$ shows the no significant broadening. We have succeeded in the measurements of the structural change from the solid solution phase to the hydride phase and have found the formation of the transient intermediate phase on this reaction process. The system is currently used to study several materials.

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