Hydrogen Absorption in Pd–Ag Systems: A TPD and Electrical Resistivity Study
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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.
Keywords:Pd-Ag alloy / hydrogen / temperature-programmed desorption / electrical resistivity
Source:Materials, 2019, 12, 19, 3160-
- Physics and Chemistry with Ion Beams (RS-45006)