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用X-ray衍射方法(XRD)研究了Mg3La合金和Mg3LaNi0.1合金吸放氢前后的结构变化.Mg3La合金和Mg3LaNi0.1合金在吸/放氢过程中的压力-组成-等温曲线(PCI)和吸氢动力学曲线表明合金能在室温下吸氢,并且具有良好的吸氢动力学特性,能在4 min之内达到饱和吸氢量的90%;其最大吸氢量分别为质量分数2.89%和2.73%.Mg3La金和Mg3LaNi0.1合金的室温吸氢动力学曲线可用Avrami-Erofeev方程拟合,说明吸氢过程符合形核长大机制.同时也计算了Mg3La-H氢化反应的熵和焓. 相似文献
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Effect of ball milling on hydrogen storage of Mg3La alloy 总被引:2,自引:0,他引:2
Hydrogen storage and microstructure of ball milled Mg3La alloy were investigated by X-ray diffraction and pressure-composition-isotherm measurement. The ball milled Mg3La alloy could absorb hydrogen up to 4wt.% at 300 ℃ for the first time, along with a decomposing course. Following tests showed that the average reversible hydrogen storage capacity was 2.7wt.%. The enthalpy and entropy of dehydrogenation reaction of the decomposed ball milled Mg3La and hydrogen were calculated. XRD patterns indicated the existence of MgH2 and LaH3 in the decomposed hydride and the formation of Mg when hydrogen was desorbed. After the first hydrogenation, all the latter hydrogenation/dehydrogenation reactions could be taken place between Mg and MgH2. The ball milled Mg3La alloy exhibited better hydriding kinetics than that of the as-cast Mg3La alloy at room temperature. The kinetic curve could be well fitted by Avrami-Erofeev equation. 相似文献
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城市特色,是城市科学的重要研究对象,又是城市发展、建设、规划设计中必然要解决的实际问题,因而,近年来一直引起国内外广泛的关注。 相似文献
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用X射线衍射方法(XRD)研究了Mg3Pr合金吸放氢前后的结构变化。Mg3Pr合金在吸/放氢过程中的压力.组成.等温曲线(PcI)和吸氢动力学曲线表明合金能在室温下吸氢,并且具有良好的吸氢动力学特性,能在4min之内达到饱和吸氢量的90%;其最大吸氢量分别为2.57%(质量分数)。Mg3Pr合金的吸氢动力学曲线可用Avrami-Erofeev方程拟合,说明吸氢过程符合形核长大机制。同时,也计算了Mg3Pr-H氢化反应的熵和焓。 相似文献
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