Palladium electrical resistivity

That the Pd-H system is composed of the units Pd and PdH has been suggested by Linde and Borelius on the basis of experiments on the behavior of the electrical resistance. Oxley7 has also suggested on the basis of susceptibility measurements that the hydrogen is in intimate association with the palladium. The study of the Pd-H system in this laboratory has been extended in other directions and the results will be reported soon. 

It is a well-known and a widely recognized fact that the electrical resistance of palladium is a function of its hydrogen content. In [118], some problems on the resistance method regarding the in situ measurement of hydrogen content is discussed. 

In studies which were described some time since1 it was found that hydrogen, when discharged electrolytically upon any one of certain metals which occlude it, produces a temporary diminution in the electrical resistance of the metal. With metals, such as palladium, which occlude large amounts, and suffer, as has long been known, a lasting increase of resistance, the diminution of resistance, or supplementary conductance, is superimposed upon the opposite and more enduring effect while in the... 

Since the fact is well established that the formation of solid solutions between two metals brings about a great increase in the electrical resistance beyond the value which would result from simple mixture, it is natural to attribute the permanent increase of resistance in hydrogen alloys such as palladium-hydrogen to this combination and if the supplementary conduction is attributed to the atomic hydrogen, it is evident that, upon the conception just outlined, this conduction must vary with the cathodic current density during electrolysis, as has been found to be the case, and must persist after the interruption of electrolysis until the equilibria of equation (1) have become established. ... 

Phosgene may be detected by the variations in the electrical resistance of a heated wire of palladium-silver alloy surrounded by the gas [1706], Methods based upon the electrical conductance of solutions, however, depend upon the production of ionic compounds for their measurement [1173,2093a], and are particularly susceptible to interference from hydrogen chloride. 

Fig. 4.2 Plots of real-time electrical resistance responses after exposure to 1% for pure palladium (a) and Pd-Ni (7% Ni) (b) alloy sensors, respectively, at room temperature. The measurement chamber had a volume of 250 mL (Reprinted with permission from Lee et al. (2010a). Copyright 2010 Elsevier)...

Sakamoto Y, Takai K, Takashima I, Imada M (1996) Electrical resistance measurements as a function of composition of palladium-hydrogen(deuterium) systems by a gas phase method. J Phys Condens Matter 8 3399-3411 Schroeder K, Ecke W, WUlsch R (2009) Optical fibre Bragg grating hydrogen sensor based on evanescent-field interaction with palladium thin-film transducer. Opt Lasers Eng 47(10) 1018-1022 Sharma AK, Gupta BD (2007) On the performance of different bimetaUic combinations in surface plasmon resonance based fiber optic sensors. J Appl Phys 101(9) 093111... 

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