Solid solubility of Mg in Ca2Ni7 and hydrogen storage properties of (Ca2―xMgx)Ni7 alloys
Solid solubility of Mg in Ca2Ni7 and hydrogen storage properties of (Ca2―xMgx)Ni7 alloys
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DOI：
10.1016/j.ijhydene.2009.03.055
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发表时间：
2009-06
影响因子：
7.2
通讯作者：
T. Si;Gang Pang;Q. Zhang;D. Liu;N. Liu
中科院分区：
文献类型：
--
作者：
T. Si;Gang Pang;Q. Zhang;D. Liu;N. Liu
研究了（Ca2−xMgx）Ni7合金的相关系和储氢性能。结果表明，Mg在（Ca，Mg）_2Ni_7相中的最大固溶度约为x=0.5。当Mg含量很低时，（Ca，Mg）2Ni7相存在“块层间”型层错。当Mg含量达到最大固溶度时，层错密度降低，晶格常数减小。因此，（Ca_（1.5）Mg_（0.5））Ni_（7）合金具有良好的吸放氢可逆性。
The phase relations and hydrogen storage properties of the (Ca2−xMgx)Ni7alloys were investigated. It was found that the maximum solid solubility of Mg in the (Ca,Mg)2Ni7phase is about x=0.5 in the present study. The ‘inter-block-layer’ type stacking faults exist in the (Ca,Mg)2Ni7phase when Mg content is very low. However, the density of stacking faults decreases and the lattice parameters reduce as Mg content increases to its maximum solid solubility. Thus the (Ca1.5Mg0.5)Ni7alloy has a good reversibility of hydrogen absorption–desorption.