The influence of structural disorder on the hydrogen absorption in amorphous and crystalline Pd-Si alloys
The influence of structural disorder on the hydrogen absorption in amorphous and crystalline Pd-Si alloys
复制标题
结构紊乱对非晶和晶态 Pd-Si 合金吸氢的影响
DOI：
10.1088/0305-4608/16/12/010
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
R. Griessen
中科院分区：
文献类型：
--
作者：
R. Feenstra;B. M. Geerken;D. G. Groot;R. Griessen
在氢气压力高达50bar、温度在333-493K之间的条件下，实验研究了几种非晶态Pd-Si合金以及晶化Pd80Si20中的吸氢行为。氢的吸收是用膨胀/电阻组合装置和微天平在现场检测的。通过对这些测量结果的比较，确定了晶格膨胀、电阻增大和氢含量之间的有用关系。结构无序的母体金属的压力-组成等温线在理论上由格位能量的高斯分布和由母体金属中的弹性和电子变化引起的非局域有效H-H相互作用相结合来描述。从相互作用能的浓度依赖关系可以推断，玻璃形成的Pd-Si合金中的费米能级位于电子态密度的极小值。
The absorption of hydrogen in several amorphous Pd-Si alloys as well as in crystallised Pd80Si20 is studied experimentally for hydrogen pressures up to 50 bar and temperatures between 333 and 493K. The absorption of hydrogen is detected in situ with a combined dilatometric/resistometric apparatus and with a microbalance. From a comparison of these measurements useful relations between lattice expansion, resistance increase and hydrogen content are determined. The pressure-composition isotherms of the structurally disordered host metals are described theoretically by a gaussian distribution of site energies, in combination with a nonlocal effective H-H interaction that arises from elastic and electronic changes in the host metal. From the concentration dependence of the interaction energy, it is deduced that the Fermi level in the glass-forming Pd-Si alloys is located at a minimum of the electronic density of states.