Influence of hydrogen on electron transport of palladium alloyed with silver

A high-pressure device for gaseous hydrogen was used for loading Pd1−xAgx alloys (x = 0.14, 0.23 and 0.39) with hydrogen. The resulting hydrogen contents, H/(Pd + Ag), ranged from 0.44 to 0.75 depending on the alloy composition. Lower hydrogen contents have been obtained by successive partial desorptions. The thermoelectric power and electrical resistance of one- and two-phase alloys have been measured simultaneously in the temperature range between 80 and 300 K. A Nordheim-Gorter type correlation of the two quantities has been observed in alloys with higher hydrogen content and the partial thermopowers corresponding to electron-phonon scattering and lattice disorder could be determined. The change of sign of the phonon thermopower was found to be in coincidence with the d-band filling.