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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。
La 2 Mg 17 and La 2 Mg 16 Ni alloys were prepared and their hydrogen storage properties were studied. The desorption isotherms of these two alloys are given, and the corresponding ΔH and ΔS values are calculated accordingly. The desorption isotherms showed that the desorption isotherms of La 2 Mg 16 Ni have two platforms corresponding to Mg 2 Ni-Mg 2 NiH 4 and Mg-MgH 2, respectively. By X-ray diffraction and electron probe analysis, the alloy with the total composition of La_2Mg_ (16) Ni is actually a two-phase mixture of La_2Mg_ (17) and Mg_2Ni. Hydrogenation products of La 2 Mg 16 Ni are La hydride and MgH 2 and Mg 2 NiH 4. The two alloys also made at room temperature and low pressure hydrogen absorption and atmospheric hydrogen absorption and other application tests. From the results of the study, La2Mg_ (17) and La_2Mg_ (16) Ni alloys are promising hydrogen storage materials.