Abstract
The electrical resistance and thermopower of amorphous Pd 83Si 17, Pd 79X 4Si 17 and Pd 73X 10Si 17 ( X = Ag, Co, Cr, Cu, Fe, Ni) were measured as functions of the hydrogen pressure in the range 1 bar–20 kbar. The electrical resistance of some of these alloys was measured as a function of the deuterium pressure in the range 1 bar–0.8 kbar. A distinct isotope effect was found. In most cases the absolute thermoelectric power is a linear function of the logarithm of hydrogen fugacity and thus is a linear function of the chemical potential of gaseous hydrogen. The electrical resistance exhibits a non-linear dependence on the chemical potential of hydrogen or deuterium in all cases. No discontinuities were observed in either property in the total pressure range. Hysteresis was observed during absorption and desorption, with increasing values at higher pressures. This suggests local restructuring in the glassy matrix as a result of the presence of hydrogen atoms. No evidence of saturation behaviour was obtained. All the measurements were carried out at 25 °C.
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