Relevance of hydrogen storage properties of ANi3 intermetallics (A = La, Ce, Y) to the ANi2 subunits in their crystal structures
Relevance of hydrogen storage properties of ANi3 intermetallics (A = La, Ce, Y) to the ANi2 subunits in their crystal structures
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DOI：
10.1016/j.actamat.2008.07.026
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发表时间：
2008-11
期刊：
影响因子：
9.4
通讯作者：
Jing Zhang;Guangyou Zhou;Guorong Chen;M. Latroche;A. Percheron-Guégan;Dalin Sun
中科院分区：
文献类型：
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作者：
Jing Zhang;Guangyou Zhou;Guorong Chen;M. Latroche;A. Percheron-Guégan;Dalin Sun
为了解其储氢稳定性差的根本原因，系统研究了ANi3金属间化合物（A=La，Ce，Y）在氢气氛下的循环行为，并与相应的ANi2金属间化合物的储氢稳定性进行了比较.所有循环的ANi3金属间化合物在一定程度上受到非晶化，类似于相应的ANi2金属间化合物。由于ANi3金属间化合物的晶体结构由ANi5亚基和ANi2亚基之间的交替堆叠组成，在ANi3金属间化合物中观察到的氢诱导非晶化被认为与ANi2亚基在其晶体结构中有关。这一假设是支持在本工作中获得的实验结果。
To understand the fundamental reason for the poor stability in hydrogen storage, the cycling behavior of ANi3intermetallics (A=La, Ce, Y) under hydrogen was systematically investigated and compared with the stability of the corresponding ANi2intermetallics. All cycled ANi3intermetallics are subject to amorphization to some extent, similar to corresponding ANi2intermetallics. Since the crystal structure of ANi3intermetallics consists of an alternating stacking between the ANi5subunit and the ANi2subunit, the hydrogen-induced amorphization as observed in ANi3intermetallics is assumed to associate with the ANi2subunits in their crystal structures. This assumption is supported by the experimental results obtained in the present work.