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Formation and crystal growth process of AlH$$_{3}$$ in Al-H system

Saito, Hiroyuki; Okajima, Yuka; Yoneda, Yasuhiro   ; Machida, Akihiko; Kawana, Daichi; Watanuki, Tetsu; Katayama, Yoshinori; Aoki, Katsutoshi

The hydrogenation process of aluminum is observed at high pressure and temperature by angle-dispersive ${it in situ}$ X-ray diffraction method. At 10 GPa and 600 $$^{circ}$$C, single crystals of AlH$$_{3}$$ about 20 $$mu$$m in size are found to grow through three steps: self-pulverization of aluminum, hydrogenation of pulverized aluminum, and solid-state grain growth of hydride. The self-pulverization seems to be the precursor of the hydrogenation reaction because it occurs at pressure temperature conditions where AlH$$_{3}$$ is thermodynamically stable.

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Category:Chemistry, Physical

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