中文摘要：

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。

英文摘要：

Hydrogen storage properties and microstructure of Mg3Pr was investigated by X-ray diffraction and pressure-composition-isotherms measurement. Mg3Pr alloy can absorb hydrogen at room temperature with rapid hydriding/dehydriding kinetics. The experimental curves of hydrogen absorption kinetics can be well fitted by averami-erofeev equation. The reversible hydrogen storage capacity of Mg3Pr reaches 2.57 wt%. The enthalpy and entropy of Mg3Pr-H dehydriding reaction were also calculated.