Magnesium effect on hydrogen-induced amorphization of Sm2-xMgxNi4 compounds
Magnesium effect on hydrogen-induced amorphization of Sm2-xMgxNi4 compounds
复制标题
镁对Sm2-xMgxNi4化合物氢致非晶化的影响
DOI：
10.1016/j.jallcom.2017.04.033
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发表时间：
2017
影响因子：
6.2
通讯作者：
Yang D. Q.
中科院分区：
文献类型：
--
作者：
Zhang Q. A.;Yang D. Q.
本文研究了镁对Sm_2-−_xMg_xNi_4化合物氢致非晶化的影响。结果表明，在x=0，0.25和0.5的化合物中出现了HIA现象。非晶态氢化物在298℃下不放氢，而准二元化合物Sm1.25Mg0.75Ni4在298℃的吸放氢循环中可以可逆地吸放氢而不发生HIA。因此，建议准二元AB2化合物发生HIA的临界RA/RB值应略高于AB2化合物发生HIA的经验值1.37。
The magnesium effect on hydrogen-induced amorphization (HIA) of Sm2−xMgxNi4compounds is investigated in this work. It is found that the HIA phenomenon occurs in the compounds withx= 0, 0.25 and 0.5. The amorphous hydrides do not desorb hydrogen at 298 K. However, the pseudo-binary Sm1.25Mg0.75Ni4compound can reversibly absorb and desorb hydrogen without the occurrence of HIA during hydrogen absorption and desorption cycles at 298 K. Hence, it is suggested that the criticalRA/RBratio for HIA of pseudo-binary AB2compounds should shift to a slightly higher value than the empirical value 1.37 for the occurrence of HIA in binary AB2compounds.