Hydrogen absorption properties of Li-Mg-N-H system
Hydrogen absorption properties of Li-Mg-N-H system
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DOI：
10.1016/j.jallcom.2005.03.068
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发表时间：
2005-09
影响因子：
6.2
通讯作者：
T. Ichikawa;K. Tokoyoda;H. Leng;H. Fujii
中科院分区：
文献类型：
--
作者：
T. Ichikawa;K. Tokoyoda;H. Leng;H. Fujii
研究了球磨3 Mg（NH 2）2和8LiH混合物在200°C高真空脱氢后在150和200°C两个温度下的等温吸氢性能。在200°C下的压力-组成等温线（PCT）曲线显示出双平台状行为，而在150°C下的PCT曲线显示出单平台状行为。在9 MPa和200°C下，氢化物相由LiH和Mg（NH 2）2组成，而在150°C下，氢化物相为LiH和LiNH 2的混合相，没有Mg（NH 2）2的痕迹。这些结果表明，在200°C下存在对应于高压和低压的两步氢化过程，但是在150°C下的动力学太慢而不能在高压区域进行第二氢化步骤。
Isothermal hydrogen absorption properties of the ball milled mixture of 3Mg(NH2)2and 8LiH after dehydrogenation at 200°C under high vacuum were investigated at two different temperatures of 150 and 200°C. The pressure–composition isotherm (PCT) curve at 200°C revealed a two-plateaus-like behavior, while the PCT curve at 150°C showed a single-plateau-like behavior. The hydrogenated phases were composed of LiH and Mg(NH2)2under 9MPa at 200°C, while those were observed as mixed phases of LiH and LiNH2at 150°C without any trace of Mg(NH2)2in XRD measurements. These results indicate that there are two-step hydrogenation processes corresponding to high and low pressures at 200°C, but the kinetics at 150°C is too slow to proceed with the second hydrogenating step at high pressure region.