摘要
研究了Cu含量变化对La0.6Nd0.4Ni4.8Mn0.2Cux(x=0,0.1,0.2,0.3,0.4)合金系的晶胞参数、热力学性能以及贮氢性能的影响,讨论了晶胞参数与吸放氢平台压力以及吉布斯自由能之间的关系。研究结果表明,随着Cu含量的增加,晶胞参数a增加,c减小,晶胞体积先增大后减小;吸放氢平台压力随着晶胞参数a的增加呈线性降低;La0.6Nd0.4Ni4.8Mn0.2Cux合金的Seitz半径随着Cu含量的增加而减小,并且与△Sd/ △Hd之间呈现非常好的线性关系,与△Sa/ △Ha之间存在双曲线关系。
The influences of Cu content on the crystal structure, thermodynamic properties and hydrogen storage performance of La0.6Nd0.4Ni4.8Mn0.2Cux （x=0, 0.1, 0.2, 0.3, 0.4） alloys were investigated and the relationships among the lattice parameter, plateau pressure and Gibbs free energy were analyzed. It was found that with the increase of the Cu content, the lattice parameter a shrunk and c expanded while the cell volume increased when x≤0.2 and then decreased when x≥0.3. The plateaw pressure linearly decreased with the increase of a. The Seitz radius decreased with the increase of the Cu content and showed a clear linear relationship with △Sd/△and an obvious hyperbolic relationship with △Sa/△Ha.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第10期1696-1700,共5页
Rare Metal Materials and Engineering
基金
High-Tech Research and Development Program of China (2006AA05Z135)
the National Natural Science Foundation of China (50776094)
关键词
贮氢合金
非化学计量比
平台压力
晶胞参数
热力学性能
hydrogen storage alloy
nonstoichiometric
plateau pressure
lattice parameters
thermodynamic Drooerties
