制备了La_2Mg_(17)和La_2Mg_(16)Ni合金,研究了其贮氢性能。给出了这两种合金的解吸等温线,并据此计算了相应的△H,△S值。解吸等温线的分析表明:La_2Mg_(16)Ni的解吸等温线有分别对应于Mg_2Ni-Mg_2NiH_4以及Mg-MgH_2的两个平台。通过X射线衍射物相分析和电子探针分析,总组成为La_2Mg_(16)Ni的合金实际上是La_2Mg_(17)型和Mg_2Ni型两相混合物。La_2Mg_(16)Ni的氢化产物是La的氢化物以及MgH_2和Mg_2NiH_4。对两种合金还作了常温低压吸氢及常压加热吸氢等应用试验。从研究结果看来,La_2Mg_(17)和La_2Mg_(16)Ni合金是性能较好的贮氢材料。
The hydrogen storage behaviour of the Mg-rich rare earth alloys, La_2Mg_(17) and La_2Mg_(16)Ni, has been investigated. Two plateaus related to the reactions Mg2Ni+2H_2(?)Mg_2NiH_4 and Mg+H_2(?)MgH_2 respectively exhibit in the pressurecomposition isotherm of La_2Mg_(16)Ni alloy. Partial substitution of Mg by Ni in La_2Mg_(17) gives a two-phase mixture: the major is La_2Mg_(17) type phase and the minor, Mg_2Ni type one. Hydriding of the La_2Mg_(16)Ni alloy leads to the formation of MgH_2, La hydride and Mg_2NiH_4. An experiment was also carried out on the hydrogen absorption by the alloys under either normal temperature and lower pressure or normal pressure and elevated temperature. It was found that La_2Mg_(17) and La_2Mg_(16)Ni seem to be the considerable hydrogen storage materials.
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