Pozio Alfonso, Jovanovic Zoran, Tosti Silvano
Department of Energy Technologies, ENEA Casaccia Research Center, Via Anguillarese 301, 00123 S. Maria di Galeria (Rome), Italy.
Laboratory of Physics, Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.
Materials (Basel). 2019 Sep 27;12(19):3160. doi: 10.3390/ma12193160.
Hydrogen retention in Pd-Ag (silver 21 wt. %) thin foil has been tested by means of temperature-programmed desorption (TPD) in the temperature range 25-200 °C and compared to the resistivity measurements for the purpose of explaining the characteristic S-shaped resistivity curve and its minimum observed in the same temperature range. The TPD results indicated that the highest uptake of hydrogen was between 65 °C and 105 °C, with a maximum at ~85 °C. Furthermore, in all examined cases, the hydrogen desorption peak was between 140 °C and 180 °C. The resistivity measurements in argon, hydrogen, and vacuum allowed us to examine the influence of hydrogen on the resistivity of a Pd-Ag alloy. The results showed evidence of two kinds of hydrides: (1) a weak absorption at low temperature (T < 70 °C) with the hydrogen present mainly in tetrahedral sites, and (2) a strong absorption up to 150 °C with the hydrogen present mainly in octahedral sites. The behaviour of the electrical resistivity and the minimum between 90 °C and 110 °C can be explained by the two kinds of hydrogen uploaded into the metal lattice.
通过程序升温脱附（TPD）在25 - 200°C温度范围内测试了Pd - Ag（银含量为21 wt.%）薄箔中的氢保留情况，并与电阻率测量结果进行比较，以解释在相同温度范围内观察到的特征S形电阻率曲线及其最小值。TPD结果表明，氢的最高吸收量在65°C至105°C之间，在约85°C时达到最大值。此外，在所有检测情况下，氢脱附峰在140°C至180°C之间。在氩气、氢气和真空中进行的电阻率测量使我们能够研究氢对Pd - Ag合金电阻率的影响。结果显示存在两种氢化物：（1）低温（T < 70°C）下的弱吸收，氢主要存在于四面体位置；（2）高达150°C的强吸收，氢主要存在于八面体位置。电阻率的行为以及90°C至110°C之间的最小值可以通过进入金属晶格的两种氢来解释。
