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Mischmetal (Mm)-nickel-manganese alloys MmNi, _zMn., (x=O.25-1.0) have been found to have the same hexagonal structure as LaNi, and MmNi5. They react readily with hydrogen to form hydrides of MmNi4.75Mno.25H85, MmNi, , , Mno, H, .., MmNi4.25Mn0, H6.5 and MmNi4.0 Mn1. oH6.5 (hydrogen content 1.5 wt%) under 60 atm hydrogen pressure and at room temperature. Dissociation pressures of these hydrides are dependent on content of manganese, which substitutes partially for nickel, and log P decreases in proportion to x. The enthalpy change in hydride formation as determined from the dissociation isotherms (Fig.3) for the MmNi4.5 Mn, 0.5-H system is given 0.2 kcal/mol, and the dissociation pressure at 30°C yields 3 atm. The desorption rate of hydrogen for MmNi4.5Mno.5 is larger than those for LaNi, and MmNi5, and a value of 5.6-6.9 kcal/mol cames out as the apparent activation energy of hydrogen desorption. For MmNi, , Mno., the hydrogen absorption-desorption cycles are repeated 30 times, but the variation in hydrogen absorption-desorption ability was hardly noticed. The hydride of MmNi, , Mno., proved very great as a hydrogen storage material.
- 公益社団法人 日本化学会の論文
公益社団法人 日本化学会 | 論文
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