Structural and hydrogenation properties of SrAl2−xNix alloys
Structural and hydrogenation properties of SrAl2−xNix alloys
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DOI：
10.1016/j.ijhydene.2008.09.063
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发表时间：
2008-12
影响因子：
7.2
通讯作者：
Yunfeng Zhu;Hua Feng;Wei Zhang-;Liquan Li
中科院分区：
文献类型：
--
作者：
Yunfeng Zhu;Hua Feng;Wei Zhang-;Liquan Li
本文采用X射线衍射仪、扫描电子显微镜和氢化测试等手段研究了−_xNix(0≤x≤_(0.4))合金的结构和氢化性能。当x=0时，合金由单一的锌相SrAl2组成。然而，Al被Ni部分取代后形成了多相组织。当x=0.1时，合金由SrAl2、Sr5Al9、SrAl和AlNi相组成。随着x的增加，SrAl2和Sr5Al9相的数量减少，而SrAl和AlNi相的数量增加。氢化温度为473K，氢气压力为3 Mpa。有趣的是，Ni替代后合金的氢化动力学得到了很大的改善，这可以归因于AlNi相的催化作用。
In this paper, Al was partially substituted by Ni in the Zintl phase alloy SrAl2and the structural and hydrogenation characteristics of the SrAl2−xNix(0≤x≤0.4) alloys were studied by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and hydrogenation measurements. The alloy consisted of a single Zintl phase of SrAl2when x=0. However, partial substitution of Al by Ni resulted in multiphase structure of the alloys. When x=0.1, the alloy was composed of SrAl2, Sr5Al9, SrAl and AlNi phases. With the increase of x, the amount of SrAl2and Sr5Al9phases decreased, while the amount of SrAl and AlNi phases increased. Hydrogenation measurements were made at 473K under 3MPa hydrogen pressure. It was interesting to find that the hydriding kinetics of the alloy was improved greatly after Ni substitution, which could be attributed to the catalysis of AlNi phase.