采用XRD及等容法研究了元素替代对LaNi4Al0.75M0.25(M=Mn, Sn, In, Ti, Zr) 合金相结构、吸放氢动力学和热力学性能的影响.结果表明:Sn,In替代对合金的吸放氢平台压力影响不大,而Mn,Ti,Zr替代明显降低了合金的平台压力;5种合金的吸氢量按替代元素Mn＞In＞Sn＞Ti＞Zr顺序降低,XRD分析结果表明降低原因是元素替代后合金中形成了杂质相;合金主相的晶胞体积与热力学焓变ΔH的绝对值大小顺序按替代元素表示均为Mn＞Zr＞Ti＞Sn＞In,而熵变ΔS差异不大.
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