LaNi5-xAlx合金的Al含量对吸氢量和平衡氢压的影响
Effect of Al Content on Hydrogen Storage Capacity and Plateau Pressure of LaNi5- xAlx-H System
查看参考文献11篇
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文摘
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在研究LaNi5-xAlx合金系的结构特性、储氢性能及热力学性能的基础上,分析讨论了Al的加入使LaNi5-xAlx合金系晶胞体积增大的同时,引起了晶格的各向异性膨胀,以及这种非平衡的空间增长对吸氢量和平衡氢压的影响.结果表明,添加Al的合金化影响了原子间的相互作用,导致了原子间距的重新调整,从而导致了储氢性能的变化.根据实验数据导出了LaNi5-xAlx金属间化合物中的Al含量x与平台压力间的对应关系.晶格的各向异性膨胀与吸氢量之间呈很好的线性关系;Seitz半径随Al的加入而增大,有利于平衡氢压的降低;同时吸氢量可能由于晶格畸变增大而减少. |
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其他语种文摘
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On the basis of investigating the structural, thermodynamic and hydrogen storage properties of La-Ni_(5-x)Al_x hydrides, the expansion of the crystal cell volumes and the anisotropic expansion along the a axis and c axis as a function of the Al concentration and their effects on the hydrogen content and the plateau pressure were discussed. The results show that aluminum substitution influences the interaction of the atoms and leads to readjustment of distances between atoms in the crystal cell. There is a linear relation between the Al content and the logarithm of the plateau pressure at a given temperature. The relationship between x in La-Ni_(5-x)Al_x and the plateau pressure is deduced from the experimental data. The hydrogen content decreases linearly with decreasing the ale ratio. Wigner Seitz radii increasing are proportious to reduce the equilibrium hydrogen pressure. The Al increasing may tend to increase crystal lattice distortion so that the hydrogen storage capacity decreases. |
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来源
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稀有金属
,2004,28(4):678-682 【核心库】
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关键词
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LaNi5-xAlx
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p-C-T
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各向异性
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吸氢量
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地址
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中国科学院金属研究所, 高性能均质合金国家工程研究中心, 辽宁, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0258-7076 |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:1613348
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