摘要
通过对LaNi5-xAlx和LaNi5-xMnx两个合金系的晶胞参数、热力学性能、吸氢量、平衡氢压等储氢性能进行对比 和分析,建立了LaNi5-xMx(M=Al,Mn)合金系中的x与平台压力以及温度间的对应关系,探讨了晶格常数和晶胞体积及合 金稳定性的变化对合金系储氢性能的影响.结果表明,与LaNi5-xAlx相比较,LaNi5-xMnx合金的晶胞体积较大,使其平衡 氢压降得更低;随x的增加,LaNi5-xMnx合金晶胞体积膨胀的各向异性程度(即晶轴比变化)较小,且合金稳定性的变化较 小,随x增加吸氢量衰减不明显.
The structure, thermodynamic, hydrogen storage capacity, plateau pressure of LaNi5-xMx (M = Al, Mn) hydrides have been investigated. A relationship among x, the plateau pressure and the temperature is derived from the experimental data. The influences of the lattice parameter and cell volume, the stability of alloys on the hydrogen storage properties are discussed. As a result, LaNi5-xMnx alloys with larger cell volumes compared with LaNi5-xAlx alloys have lower plateau pressure. The anisotropic degree of the crystal volumes expansion in directions of the a and c axis and the change of stability of LaNi5-xMx alloys as a function of the Mn content are smaller than that as a function of the Al content. It is in agreement with the unconspicuous attenuation of hydrogen storage capacity in LaNi5-xMnx.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第4期427-432,共6页
Acta Metallurgica Sinica
基金
国家自然科学基金资助项目50276063
