论文标题
SM $ _ {1-x} $ mg $ _x $ ni $ _y $ $ $（y = 3.5或3.8）的热力学和腐蚀研究
Thermodynamic and corrosion study of Sm$_{1-x}$Mg$_x$Ni$_y$ (y = 3.5 or 3.8) compounds forming reversible hydrides
论文作者
论文摘要
AB5化合物（A =稀土，B =过渡金属）已被广泛研究为Ni-MH应用的阳极。但是，他们已经达到了技术局限性，并且可以预见到具有高容量的新有前途的材料。 ABY化合物（2 <Y <5）是好的候选人。它们是通过沿C晶体学轴堆叠[AB5]和[A2B4]单元来制成的。后一个单元允许容量大大增加，而[AB5]单元具有良好的循环稳定性。因此，预计AB3.8组合物（即具有三个[AB5]的A5B19 [AB5] [A2B4]）的循环稳定性比AB3.5（即A2B7（即具有两个[AB5]）的A2B7（a2b4]）更好。此外，用光镁取代稀土可提高能力和骑自行车的稳定性。在本文中，我们比较了两种二进制化合物的氢化和腐蚀特性SMNI $ _ {3.5} $和SMNI $ _ {3.8} $和两个伪二元（SM，mg）Ni $ _ {3.5} $ {3.5} $ and（sm，mg）and（sm，mg）ni $ _ $ _ $ _ {3.8} $ {3.8} 3.8} $。对于二进制SMNI $ _ {3.8} $，突出显示了更好的实心循环稳定性。伪二元化合物的循环稳定性也比二元循环稳定性更高。此外，研究了它们对腐蚀的抗性。
AB5 compounds (A = rare earth, B = transition metal) have been widely studied as anodes for Ni-MH applications. However, they have reached their technical limitations and the search for new promising materials with high capacity is foreseen. ABy compounds (2 < y < 5) are good candidates. They are made by stacking [AB5] and [A2B4] units along the c crystallographic axis. The latter unit allows a large increase in capacity, while the [AB5] unit provides good cycling stability. Consequently, the AB3.8 composition (i.e. A5B19 with three [AB5] for one [A2B4]) is expected to exhibit better cycling stability than the AB3.5 (i.e. A2B7 with two [AB5] for one [A2B4]). Furthermore, substitution of rare earth by light magnesium improves both the capacity and cycling stability. In this paper, we compare the hydrogenation and corrosion properties of two binary compounds SmNi$_{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.
