采用磁场辅助烧结合成法(MASS)制备了化学计量比为La0.67Mg0.33Ni3的储氢合金,通过X射线衍射(XRD)、等温定容法(PCT)和差示扫描量热法(DSC)分析了合金的相结构和吸放氢性能.XRD结果显示:合金主相为PuNi3型结构的(La,Mg)Ni3,氢化后分解为以La2Ni7 MgNi2和LaNi3结构为主的复相产物,合金因吸氢发生晶格膨胀.PCT测试表明:1T磁场下合成的合金在室温下具有最小的滞后系数(0.480)、最大的放氢量1.307(质量分数,％),综合性能最优.该合金放氢DSC曲线上有2个交叠的吸热峰,分别对应于(La,Mg)Ni3和LaNi5氢化后的放氢过程.
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