Electrical resistance measurements as a function of composition of palladium - hydrogen(deuterium) systems by a gas phase method
Electrical resistance measurements as a function of composition of palladium - hydrogen(deuterium) systems by a gas phase method
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通过气相法测量电阻随钯-氢（氘）系统成分的变化
DOI：
10.1088/0953-8984/8/19/015
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
M. Imada
中科院分区：
文献类型：
--
作者：
Y. Sakamoto;K. Takai;I. Takashima;M. Imada
在273 ~ 323 K温度和3.3MPa压力下，同时测量了Pd-H和Pd-D体系的相对电阻和平衡氢、氘压与组成的关系。在吸收过程的两相区中的相对电阻，与先前通过电解方法观察到的较大变化相比，显示出随着H（D）含量的增加，特别是对于Pd-H系统，非常小且几乎线性地增加。电阻行为与p-c等温线关系的形状十分相似.在298 K时，Pd-H和Pd-D体系中H（D）/Pd含量每单位变化的相对电阻增量分别比两相区中H（D）/Pd含量的相对晶格参数变化大1.5倍和2.1倍。其中是不含H（D）的Pd的晶格参数，r是原子比。另一方面，除了高H（D）含量区域之外，在单一固溶体相和单相中的电阻增量与由于溶解的氢和氘引起的晶格膨胀的变化相比显著更大。因此，电阻随两相区中氢和氘含量的变化可能主要与相内氢化物的非相干形成有关。在298 K下，从吸附到3.3MPa，Pd-H和Pd-D体系的后续脱附过程的相对阻力几乎与吸附过程的最大值相同，即在约和约，然后随着H（D）含量的降低而逐渐减小，直到相界组成;在进入两相区时，即对于Pd-H系统和对于Pd-D系统，这些值几乎保持恒定。这种大的电阻滞后可归因于伴随着氢化物（氘化物）形成的位错形成以及相区中进一步高度溶解的氢和氘的“晶格应变变形”的产生。
The simultaneous measurement of both the relative electrical resistance and the equilibrium hydrogen and deuterium pressure as a function of composition of Pd - H and Pd - D systems have been carried out at temperatures between 273 and 323 K at pressures up to about 3.3 MPa. The relative resistance, , in the two-phase region for the absorption processes shows a very small and almost linear increase with increasing H(D) content, especially for the Pd - H system, compared to the larger changes previously observed by the electrolysis method. The resistance behaviour is quite similar to the shape of p - c isotherm relationships. The relative resistance increments per unit change of H(D)/Pd content at 298 K, , in the two-phase region are about 1.5 and 2.1 times larger for the Pd - H and Pd - D systems, respectively, compared to the changes in the relative lattice parameters with H(D)/Pd content, , within the two-phase region, where is the lattice parameter of H(D)-free Pd and r is the atom ratio. On the other hand, the resistance increment in the single solid solution phase and single phase, except for the higher-H(D)-content region, is significantly larger compared to the changes of the lattice expansion due to dissolved hydrogen and deuterium. Thus, the variation in resistance with hydrogen and deuterium content in the two-phase region may be mainly associated with an incoherent formation of hydride within the phase. The relative resistance for the subsequent desorption processes from the absorption up to about 3.3 MPa at 298 K in both Pd - H and Pd - D systems exhibits almost the same maximum as that of the absorption processes, i.e. at about and at about , and then the values decrease gradually with decreasing H(D) content up to the phase boundary composition; on entering the two-phase region, the values remain almost constant, i.e. for the Pd - H system and for the Pd - D system. This large hysteresis of resistance can be attributed to the creation of `lattice strain deformations' accompanied by dislocation formation from hydride (deuteride) formation and by further highly dissolved hydrogen and deuterium in the phase region.