The pressure-temperature diagram of hydrogen-aluminum system was determined for a pressure range of 0–10GPa and a temperature range of 27–800°C by in situ x-ray diffraction measurements. Pristine aluminum was hydrogenated to trihydride at 8.9GPa and 600°C. The cyclic formation and decomposition of the hydride resulted in lowering of the hydrogenation conditions down to 4.9GPa and 330°C. Transparent single crystals were recovered at ambient conditions.
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Saitoh et al. (2008) studied this question.
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