Crystal structures of novel La–Mg–Ni hydrogen absorbing alloys
Crystal structures of novel La–Mg–Ni hydrogen absorbing alloys
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DOI：
10.1016/j.jallcom.2005.04.180
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发表时间：
2006-02
影响因子：
6.2
通讯作者：
E. Akiba;H. Hayakawa;T. Kohno
中科院分区：
文献类型：
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作者：
E. Akiba;H. Hayakawa;T. Kohno
研究了La0.70Mg0.30Ni2.5Co0.5(合金T1)和La0.75Mg0.25Ni3.0Co0.5(合金T2)的晶体结构。通过对破碎铸锭中拾取的小颗粒的结构分析，我们发现合金T1由Ce2Ni7型和PuNi3型相组成，合金T2由Ce2Ni7型和Pr5Co19型相组成。这些相由两个或三个块组成，其中沿 c 轴由一层 [La2Ni4] 层和一到三层 [LaNi5] 层组成。发现Mg占据了[La2Ni4]层中的La位点。 Mg选择性占据[La2Ni4]层中的La位使得合金在反复加氢和脱氢中保持稳定。
Crystal structures of La0.70Mg0.30Ni2.5Co0.5(alloy T1) and La0.75Mg0.25Ni3.0Co0.5(alloy T2) were investigated. From the structural analysis for small particles picked up from crushed ingot, we found that the alloy T1 consisted of Ce2Ni7-type and PuNi3-type phases and that the alloy T2 consisted of Ce2Ni7-type and Pr5Co19-type phases. These phases were made up two or three blocks that consisted of one [La2Ni4] layer and one to three [LaNi5] layers along c-axis. It was found that Mg occupied the La site in the [La2Ni4] layer. Selective occupation of Mg at the La site in the [La2Ni4] layer makes the alloy stable in repeated hydrogenation and dehydrogenation.