Sm $_{1-x}$ Mg $_x$ Ni $_y$（y = 3.5或3.8）化合物形成可逆双金属的热力学和腐蚀研究
Thermodynamic and corrosion study of Sm$_{1-x}$Mg$_x$Ni$_y$ (y = 3.5 or 3.8) compounds forming reversible hydrides
摘要：
AB 5化合物（A =稀土，B =过渡金属）作为Ni-MH应用的阳极已被广泛研究。然而，它们已经达到了它们的技术极限，并且可以预见寻找具有高容量的新的有前途的材料。ABy化合物（2 < y < 5）是很好的候选化合物。它们是由[AB 5]和[A2 B4]单元沿c晶轴堆叠而成。后一个单元允许容量的大幅增加，而[AB 5]单元提供良好的循环稳定性。因此，AB3.8组合物（即A5 B19与三个[AB 5]对一个[A2 B4]）预期表现出比AB3.5（即A2 B7与两个[AB 5]对一个[A2 B4]）更好的循环稳定性。此外，用轻镁代替稀土提高了容量和循环稳定性。本文比较了两种二元化合物SmNi $_{3.5}$和SmNi $_{3.8}$以及两种伪二元化合物（Sm，Mg）Ni $_{3.5}$和（Sm，Mg）Ni $_{3.8}$的加氢和腐蚀性能。SmNi $_{3.8}$具有较好的固-气循环稳定性。伪二元化合物也表现出比二元化合物更高的循环稳定性。此外，他们的耐腐蚀性进行了研究。
英文摘要：
AB5 compounds (A = rare earth, B = transition metal) have been widely studied as anodes for Ni-MH applications. However, they have reached their technical limitations and the search for new promising materials with high capacity is foreseen. ABy compounds (2 < y < 5) are good candidates. They are made by stacking [AB5] and [A2B4] units along the c crystallographic axis. The latter unit allows a large increase in capacity, while the [AB5] unit provides good cycling stability. Consequently, the AB3.8 composition (i.e. A5B19 with three [AB5] for one [A2B4]) is expected to exhibit better cycling stability than the AB3.5 (i.e. A2B7 with two [AB5] for one [A2B4]). Furthermore, substitution of rare earth by light magnesium improves both the capacity and cycling stability. In this paper, we compare the hydrogenation and corrosion properties of two binary compounds SmNi$_{3.5}$ and SmNi$_{3.8}$ and two pseudo-binary ones (Sm,Mg)Ni$_{3.5}$ and (Sm,Mg)Ni$_{3.8}$. A better solid-gas cycling stability is highlighted for the binary SmNi$_{3.8}$. The pseudo-binary compounds also exhibit higher cycling stability than the binary ones. Furthermore, their resistance to corrosion was investigated.
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