(1. 北京有色金属研究总院 能源材料及技术研究中心，
北京 100088；
2. 北京科技大学 理化系， 北京 100083)
摘 要: 用氢化燃烧法合成Mg2-xAgxNi (x=0.05, 0.1, 0.2, 0.5)和
Mg2-xAlxNi (x=0, 0.1, 0.2, 0.5)。 PCT结果说明合成的Mg-Ni-Ag和Mg-Ni-Al储氢合金材料具有很高的活性和理想的储氢性能。 对两个体系的PCT结果分别进行计算， 得出温度和氢平衡压的关系式。 在423K时Mg1.8Ag0.2Ni在5min之内的放氢量为2.14%/min(质量分数)； Mg1.5Al0.5Ni在α+β相区的吸氢速率为4.88%/min(质量分数)， 放氢速率为1.26%/min(质量分数)。 用XRD方法进行物相分析表明： 添加少量银没有改变Mg2Ni的结构； 添加铝却改变了Mg2Ni的结构，使储氢合金材料的储放氢动力学性能均得到改善。
关键字: 氢化燃烧合成； 储氢合金； Mg-Ag-Ni； Mg-Al-Ni； 储氢性能
（1. Research Center of Energy Materials and Technology,General Research Institute for Nonferrous Metal, Beijing 100088, China;
2. Department of Physical Chemistry,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Mg2-xAgxNi (x=0.05, 0.1, 0.2, 0.5) and Mg2-xAlxNi (x=0, 0.1, 0.2, 0.5) ternary alloys were synthesized by hydriding combustion. All the alloys were examined by means of pressure-composition isotherms(PCT) and X-ray diffraction (XRD). The relationships between the equilibrium plateau pressure and the temperature were calculated. The alloy Mg1.8Ag0.2Ni desorbs 2.14%H in less than 5min at 423K and under the same condition the kinetic rates of Mg1.5Al0.5Ni in α+β phase are 4.88%/min H for absorption and 1.26%/min H for desorption. The results of XRD show that the kinetics of the materials are improved due to the change of structure of Mg2Ni and chemical homogeneity on surface of particles.
Key words: hydriding combustion synthesis; hydrogen storage alloys; Mg-Ag-Ni; Mg-Al-Ni; property of hydrogen storage
